Create openhands-resolver.yml

[bernalde]

This pull request introduces a new GitHub Actions workflow to automate issue and pull request management using the OpenHands resolver. The changes involve setting up the workflow configuration and specifying the necessary permissions and secrets.

Key changes include:

• Added a new workflow file .github/workflows/openhands-resolver.yml to handle issue and pull request events.
• Configured the workflow to trigger on various events such as issue labeling, pull request labeling, issue comments, pull request review comments, and pull request submissions.
• Defined permissions for contents, pull-requests, and issues to be writable.
• Set up a job to call the OpenHands resolver with parameters for macro, max iterations, base container image, LLM model, and target branch.
• Included secrets for PAT token, PAT username, LLM API key, and LLM base URL to be used by the workflow.

[ZedongPeng]

The autotest failed due to the release of black 25.1.0.