Dump github/gitlab/gitea repository data to a local directory and restore to gitea (#12244)
* Dump github/gitlab repository data to a local directory
* Fix lint
* Adjust directory structure
* Allow migration special units
* Allow migration ignore release assets
* Fix lint
* Add restore repository
* stage the changes
* Merge
* Fix lint
* Update the interface
* Add some restore methods
* Finish restore
* Add comments
* Fix restore
* Add a token flag
* Fix bug
* Fix test
* Fix test
* Fix bug
* Fix bug
* Fix lint
* Fix restore
* refactor downloader
* fmt
* Fix bug isEnd detection on getIssues
* Refactor maxPerPage
* Remove unused codes
* Remove unused codes
* Fix bug
* Fix restore
* Fix dump
* Uploader should not depend downloader
* use release attachment name but not id
* Fix restore bug
* Fix lint
* Fix restore bug
* Add a method of DownloadFunc for base.Release to make uploader not depend on downloader
* fix Release yml marshal
* Fix trace information
* Fix bug when dump & restore
* Save relative path on yml file
* Fix bug
* Use relative path
* Update docs
* Use git service string but not int
* Recognize clone addr to service type
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