* Add namespcace ID attribute
This commit also introduce `id` comouted value which is numeric value
used by GitLab to iteract with repository. This should simplify use of
`gitlab_project_hook` usage and would allow to introduce other resources
as described in #14471
* Fixes requested by @richardc
* Handle optional `namespace_id`
Here we add a basic provider with a single resource type.
It's copied heavily from the `github` provider and `github_repository`
resource, as there is some overlap in those types/apis.
~~~
resource "gitlab_project" "test1" {
name = "test1"
visibility_level = "public"
}
~~~
We implement in terms of the
[go-gitlab](https://github.com/xanzy/go-gitlab) library, which provides
a wrapping of the [gitlab api](https://docs.gitlab.com/ee/api/)
We have been a little selective in the properties we surface for the
project resource, as not all properties are very instructive.
Notable is the removal of the `public` bool as the `visibility_level`
will take precedent if both are supplied which leads to confusing
interactions if they disagree.