This pull request adds a GitHub-compatible API endpoint to lock and
unlock an issue.
The following routes exist now:
- `PUT /api/v1/repos/{owner}/{repo}/issues/{id}/lock` to lock an issue
- `DELETE /api/v1/repos/{owner}/{repo}/issues/{id}/lock` to unlock an issue
Fixes#33677Fixes#20012
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>