feat(amazonq): add diagnostics and editor controlling support for Flare

[MarcoWang3]

Problem

No protocol method is available for Flare to get specific files' VSC diagnostic information or open editors for files in VSC.

Solution

Add the support.

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
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