Add feature to create submodules in repositories

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New Resource

I'm missing a resource to create submodules within repositories.

It could look something like this:

resource "gitlab_repository_submodule" "inventory" {
  project          = gitlab_project.this.id
  branch           = "main"
  submodule_path   = "inventory"
  submodule_source = "git@gitlab.com:myorg/inventory.git"
  commit_message   = "add inventory submodule"
}

Related GitLab APIs

API documentation: https://docs.gitlab.com/ee/api/repository_submodules.html (can only update existing submodule for now)

Additional Details

• GitLab REST API resources available (read for data sources, crud for resources)
• go-gitlab does support the related GitLab API already. Relevant go-gitlab file: https://github.com/xanzy/go-gitlab/blob/master/repository_submodules.go
• I'd like to contribute it myself