Add a data_source for determining the current_user

Created by: PatrickRice-KSC

Feature Description

We'd talked during the community hour about their having been a historical request for the ability to pull the current user via a data source. I couldn't find the issue, so I'm creating a new one.

The issue will add a new data_source that will allow a user to determine the current_user, as specified by the input API token to the provider.

Expected usage:

data "gitlab_current_user" "current" {}

Do you want to implement this?

• I would like to implement this myself 👷