Add gc api of regsistryctl to swagger file
Add gc api of regsistryctl to swagger file

The api includes to trigger gc and add/update/delete gc schedule

Signed-off-by: Wang Yan <63b20dea16c07a874bc9bf767df5575676113cb6@vmware.com>

reasonerjt/harbor,steven-zou/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,steven-zou/harbor,steven-zou/harbor,reasonerjt/harbor,reasonerjt/harbor,steven-zou/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,steven-zou/harbor,steven-zou/harbor,wy65701436/harbor