action for verifying author of vendor.schema.json

[chirag-jn]

Fixes #297

I have added a workflow to verify author of vendor.schema.json.
Steps followed:

1. Discover if changes have been made in vendor.schema.json
2. Fetch the commit author
3. Fetch authors in @superlinked/vdb-table-maintainers team
4. Verify if the commit author is a part of the team
5. If the author is not part of the team, then send a message in the PR to request the author to start a new issue for the change.

[github-actions]

This PR contains schema changes. Please note that schema changes affect all vendors simultaneously.
@ Could you create a separate issue to discuss the necessity for this schema change with @vdb-table-maintainers? This will help ensure proper review and coordination.

[github-actions]

This PR contains schema changes. Please note that schema changes affect all vendors simultaneously.
@chirag-jn Could you create a separate issue to discuss the necessity for this schema change with @vdb-table-maintainers? This will help ensure proper review and coordination.