Feature Request - add support of Group merge request approval settings

New Resource

Feature Request - add support of Group merge request approval settings Now there is possibility to control merge request approval settings on project level

It will be great to add support of https://docs.gitlab.com/ee/user/group/manage.html#group-merge-request-approval-settings

Group approval settings manage project merge request approval settings at the top-level group level. These settings cascade to all projects that belong to the group.

I'm looking for something that I could use like this:

resource "gitlab_group_approval_rule" "xxx" {
    group = "xxx"
}

Related GitLab APIs

https://docs.gitlab.com/ee/api/merge_request_approval_settings.html