Add templates for Github Issues and PRs

.github/ISSUE_TEMPLATE/1-bug.yml

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+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+name: Bug Report
+description: Something isn't working as expected.
+title: "[Bug] "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thank you very much for your feedback!
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: Please search for similar issues before creating a new one.
+      options:
+        - label: I searched in the [issues](https://github.com/apache/flink-agents/issues) and found nothing similar.
+          required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: Please describe the problem you are facing. What are the expected behaviors and what you are actually seeing. Any error messages and logs are also helpful.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: How to reproduce
+      description: Please provide the steps to reproduce this problem.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Version and environment
+      description: Please provide the Flink Agent version you're using. Additional information such as Flink version and deployment mode, Java / Python environments and OS architecture may also be helpful.
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit a PR?
+      options:
+        - label: I'm willing to submit a PR!

.github/ISSUE_TEMPLATE/2-feature.yml

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+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+name: Feature
+description: New features or improvements to existing features.
+title: "[Feature] "
+labels: ["feature"]
+body:
+  - type: markdown
+    attributes:
+      value: Thank you very much for your feature proposal!
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: Please search for similar issues before creating a new one.
+      options:
+        - label: I searched in the [issues](https://github.com/apache/flink-agents/issues) and found nothing similar.
+          required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: Please describe the proposed feature or improvement. What problem does it solve? Or what value does it bring? Do you already have a solution in mind?
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit a PR?
+      options:
+        - label: I'm willing to submit a PR!

.github/ISSUE_TEMPLATE/3-techdebt.yml

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+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+name: Technical Debt
+description: User-unaware issues, such as code refactor and infrastructure maintenance.
+title: "[Tech Debt] "
+labels: ["tech debt"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you very much for raising the technical debt!
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: Please search for similar issues before creating a new one.
+      options:
+        - label: I searched in the [issues](https://github.com/apache/flink-agents/issues) and found nothing similar.
+          required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: Please describe the task. What is currently not ideal? How should it be fixed or improved?
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit a PR?
+      options:
+        - label: I'm willing to submit a PR!

.github/ISSUE_TEMPLATE/config.yml

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+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+blank_issues_enabled: false

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+* Thank you very much for contributing to Flink Agents.
+* Please add the relevant components in the PR title. E.g., [api], [runtime], [java], [python], [hotfix], etc.
+-->
+
+<!-- Please link the PR to the relevant issue(s). Hotfix doesn't need this. -->
+Linked issue: #xxx
+
+### Purpose of change
+
+<!-- What is the purpose of this change? -->
+
+### Tests
+
+<!-- How is this change verified? -->
+
+### API
+
+<!-- Does this change touches any public APIs? -->
+
+### Documentation
+
+<!-- Should this change be covered by the user documentation?-->