feat: add parameter to specify bicepconfig.json file

[stektron]

Description

Add an optional parameter to specify an bicepconfig.json file that will override the default config file and the normal file resolution process

• add a new, optional '--config' parameter to specify a specific bicepconfig.json
• update unit tests
• add fallback logic

Example Usage

bicep lint main.bicep --config /foo-bar/override.json

Checklist

• I have read and adhere to the contribution guide.

Microsoft Reviewers: Open in CodeFlow

[stektron]

@microsoft-github-policy-service agree

[stektron]

This commit is a working example of using the new --config parameter to specify the bicepconfig.json file when using the bicep lint command.

If this approach is accepted, I can add support for the other cli params (build, restore, decompile, generate-params, jsonrpc, snapshot). Though I'm not sure if bicep publish can use this.

To give more info, I was attempting to add this to the super-linter repo, and specifying a custom config file location is a bit of a wrinke
super-linter/super-linter#8025