feat: Add GitLab server and repo list API

Created by: harrisonliu5

Signed-off-by: harrisonliu5 harrisonliu_5@163.com

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##1387 (closed)

Special notes for reviewers:

Additional documentation, usage docs, etc.:

/assign @leoendless /assign @LinuxSuRen