Additional options available for pull request reviews / branch protection rules

[Starttoaster]

One such rule that is currently not supported is bypass_pull_request_allowances (https://docs.github.com/en/rest/branches/branch-protection#update-pull-request-review-protection)

The library should be updated to include additional fields.

I'm more than happy to take a stab at doing this myself as a first contribution, just using this Issue to document the request.

[gmlewis]

Thank you, @Starttoaster ! It's yours.