Forgejo Support

[lachmanfrantisek]

Since there is a significant chance that Fedora will pick Forgejo as its forge of choice, let's be prepared and plan what it would take to support it in OGR.

• Research Forgejo implementation and plan the tasks #867

Implementation:

• Implement base for Forgejo support #875
• Implement support for Forgejo user #876
• Implement support for Forgejo projects #877
• Implement support for Forgejo project permissions #878
• Implement support for Forgejo PRs #879
• Implement support for Forgejo issues #880
• Implement support for Forgejo releases and tags #881
• Implement support for Forgejo commit statuses #882
• Implement support for Forgejo comments and reactions on it #883

[dcermak]

Just fyi, I've been using my autogenerated API wrapper from the openAPI spec for gitea: https://github.com/dcermak/py-gitea-opensuse-org. Creating something similar for forgejo should be possible and could theoretically be embedded in this repo directly.