Add documentation for using the RayProvider for Cloud Providers

[CaliWee]

I am using Ray on GKE in Google Cloud. How can I specify where Ray is running using the RayOperators?

Currently, we use the GKEOperator which allows you to specify things like project_id, and cluster_name - https://cloud.google.com/composer/docs/using-gke-operator#launch_workloads_in_the_cluster

[CaliWee]

After diving in a bit further, it looks like it could be possible by being able to configure these attributes of the RayHook - https://github.com/astronomer/astro-provider-ray/blob/main/ray_provider/hooks/ray.py#L104-L106, but I haven't been able to find docs on _get_field and it doesn't seem like these fields are exposed to the user at the moment from higher level classes like the SubmitJobOperator