SDK Services: Add Support for Azure and GCP

[hriebesehl]

Currently methods ClusterService.create_cluster(), ClusterService.edit_cluster(), InstancePoolService.create_instance_pool(), and InstancePoolService.edit_instance_pool() only support API calls to AWS-based databricks workspaces. I'd recommend adding azure_attributes and gcp_attributes as parameters to these functions to support API calls on all platforms.

Happy to submit a PR if this solution is OK.