Go VcsGitProvider support for all types supported by Jfrog

[crish963]

Artifactory today supports many VcsGitProvider clients but the library is not supporting many.

I would like to see options like GitHub Cloud, GitHub server, GitLab, Bitbucket cloud, Bitbucket server instead of existing ones defined here.
https://github.com/jfrog/artifactory-client-java/blob/master/api/src/main/java/org/jfrog/artifactory/client/model/repository/settings/vcs/VcsGitProvider.java#L7