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

[meteorlxy]

Close #7

Related issues of gitea:

Required:

• OAuth2 Provider: Integrate OAuth2 Provider go-gitea/gitea#5378
• Flexible redirect_uri of OAuth2: [Feature Request] Flexible redirect_uri of OAuth2 go-gitea/gitea#9514

Optional:

• OAuth2 Implicit Grant Type
• Comments pagination and sorting: Feature Request: add pagination and sort on Issue Comments API go-gitea/gitea#6132
• Reactions API: Feature Request: GET/POST/DELETE reactions via API go-gitea/gitea#6134
• Get reactions without token: [Feature Request] Allow GET comments reactions without token via API go-gitea/gitea#9543
• Return HTML string directly: Feature Request: return parsed markdown body (html body) via API go-gitea/gitea#6135
• Access Token endpoint supports JSON: [Bug Report] OAuth Access Token endpoint does not support JSON go-gitea/gitea#6624
• Markdown parse emoji: [Bug Report] Markdown API does not parse emoji go-gitea/gitea#6628

[6543]

@meteorlxy just to mention: gitea support reaction now via API (go-gitea/gitea#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