Add support for required reviews in rulesets

[sstrullmyer]

GitHub announced support in rule sets for requiring team approvals prior to merging changes into protected branches. This seems like a useful feature to support in Terraform

Here is a sample portion of the API response for a ruleset with this configured (received via the Get a repository ruleset endpoint)

 "rules": [
 {
 "type": "pull_request",
 "parameters": {
 "required_approving_review_count": 0,
 "dismiss_stale_reviews_on_push": false,
 "required_reviewers": [
 {
 "minimum_approvals": 1,
 "file_patterns": [
 "*"
 ],
 "reviewer": {
 "id": 123456,
 "type": "Team"
 }
 }
 ],
 "require_code_owner_review": false,
 "require_last_push_approval": false,
 "required_review_thread_resolution": false,
 "automatic_copilot_code_review_enabled": false,
 "allowed_merge_methods": [
 "merge",
 "squash",
 "rebase"
 ]
 }
 }
 ]

[gmlewis]

Thank you, @sstrullmyer!

This would be a great PR for any new contributor to this repo or a new Go developer.
All contributions are greatly appreciated!

Feel free to volunteer for any issue and the issue can be assigned to you so that others don't attempt to duplicate the work.
Also feel free to perform a code review on any PR that has the label "NeedsReview" - we appreciate those contributions too!
We have a REVIEWERS file that you could add your username to if you are willing to be contacted when reviews are needed.

Please check out our CONTRIBUTING.md guide to get started. (In particular, please remember to go generate ./... and don't use force-push to your PRs.)

Thank you!

[smazmi]

Hey @gmlewis!
I’ve read through the CONTRIBUTING.md guide and I’m ready to get started. Could you please assign this issue to me? I’d love to work on it.

[gmlewis]

Hey @gmlewis! I’ve read through the CONTRIBUTING.md guide and I’m ready to get started. Could you please assign this issue to me? I’d love to work on it.

Thank you, @smazmi! It's yours.