Add the ability to set an avatar on users

Mark Nessenrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:feat/add-avatar-support-to-project-access-token into main

New resource that provides the ability to set an avatar on a user. This includes project and group access tokens and service accounts too. It uses the token value to upload the avatar.

Closes #6322

Edited by Mark Nessen

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