* Add new data source: compute region instance group manager's groups.
* Add documentation for wait_for_instances and for the timeout mechanism in resourceComputeRegionInstanceGroupManagerCreate.
* Add the "compute_global_address" datasource
* Add a basic test for the "compute_global_address" datasource
* Include the "compute_global_address" in the provider
* Add docs for the "compute_global_address" datasource
* Add the "compute_address" datasource
* Add a basic test for the "compute_address" datasource
* Include the "compute_address" datasource in the provider
* Add the documentation for the "compute_address" datasource