Add rulesets resource

[moltar]

https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/managing-rulesets/about-rulesets

https://docs.github.com/en/rest/repos/rules?apiVersion=2022-11-28

[LucasQChen]

Thanks @moltar. We will add this to the roadmap and review when it can be done.