feat(api-gitea-v1): add gitea api v1 package

[meteorlxy]

Close #7

Related issues of gitea:

Required:

• [x] OAuth2 Provider: https://github.com/go-gitea/gitea/pull/5378
• [ ] Flexible redirect_uri of OAuth2: https://github.com/go-gitea/gitea/issues/9514

Optional:

• [ ] OAuth2 Implicit Grant Type
• [ ] Comments pagination and sorting: https://github.com/go-gitea/gitea/issues/6132
• [x] Reactions API: https://github.com/go-gitea/gitea/issues/6134
• [ ] Get reactions without token: https://github.com/go-gitea/gitea/issues/9543
• [ ] Return HTML string directly: https://github.com/go-gitea/gitea/issues/6135
• [x] Access Token endpoint supports JSON: https://github.com/go-gitea/gitea/issues/6624
• [ ] Markdown parse emoji: https://github.com/go-gitea/gitea/issues/6628

[6543]

@meteorlxy just to mention: gitea support reaction now via API (https://github.com/go-gitea/gitea/pull/9220)

[meteorlxy]

@6543 Thanks for the great work!

However, I found that reactions API always check auth.

If the user does not login, we can get the issues / comments / markdown correctly, but receive a 401 when trying to get reactions:

[meteorlxy]

Ready to merge.

The remaining issues migrated to #73