Add resource provider registration resource

[hyperfocus1337]

PR Checklist

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• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] My code follows the code style of this project.
• [x] I ran lint checks locally prior to submission.
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

Adds support for the Terraform azurerm_resource_provider_registration resource.

Related to PR https://github.com/aztfmod/terraform-azurerm-caf/pull/1234.

Does this introduce a breaking change

• [ ] YES
• [ ] NO

Testing