Find commit comment using the commit ID

[yeikel]

Currently to find a comment, we need to specify an issue number https://github.com/peter-evans/find-comment/blob/main/action.yml#L10-L12

It would be a great addition to have the option to specify a commit instead. An example use case would be :

1. Find the comment of a specific commit (this action)
2. Replace the comment of the commit using commit-comment