feat: add schema and data options for apps management commands

[ramya18101]

🔧 Changes

Extends the JSON-input / schema-discovery surface to the auth0 apps commands,
mirroring the pattern already applied to actions, roles, users, and apis
with machine-readable schemas and whole-payload JSON).

📚 References

Follows the same pattern as the merged actions/roles/users/apis PRs

🔬 Testing

• Added internal/cli/apps_json_test.go:
  • TestAppsListCmdInvalidQuery — invalid --query JSON is rejected before any
    API call.
  • TestAppsCreateCmdData — a valid --data payload is sent as POST /clients;
    a schema-invalid payload ({"name":123}) fails validation and never reaches
    the API.
  • TestAppsUpdateCmdData — --data with an ID is sent as PATCH /clients/<id>.
• make lint, make build, make test-unit, and make docs (check-docs) all pass.
• Manual (live tenant), for reviewers:
  • auth0 apps create --schema / auth0 apps list --schema — prints schema, no write.
  • auth0 apps create --data '{"name":"myapp","app_type":"spa"}'
  • auth0 apps update <app-id> --data '{"description":"updated"}'
  • auth0 apps list --query '{"app_type":"spa"}'
  • Mutual exclusion: auth0 apps create --data '{"name":"x"}' --name y errors.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[developerkunal]

LGTM