Support all attributes supported by API in gitlab_project resource

Created by: Zyava

I'm very surprised that gitlab_project resource doesn't support all attributes available in the API: https://docs.gitlab.com/ee/api/projects.html#create-project. Please support all attributes API supports - like it is done in other providers (AWS, k8s, etc.)

Terraform Version

TF 0.13.5, Gitlab provider version 3.1.0

Affected Resource(s)

• gitlab_project

Expected Behavior

All attributes accepted by Gitlab API (https://docs.gitlab.com/ee/api/projects.html#create-project) are supported by gitlab_project resource.

Actual Behavior

Some random subset of attributes is supported.