Add command create

Adds support for

gitlab-releaser create --name "release name" --description "release description" --tag-name "tag" --ref "COMMIT REF/Branch name"

Please note it builds on top of add-gitlab-client branch and !5 (merged)

Sample job:

https://gitlab.com/gitlab-org/gitlab-releaser/-/jobs/460159040

Releases

https://gitlab.com/gitlab-org/gitlab-releaser/-/releases