Make CLI resource turn up and clean up behavior configurable

[JyotinderSingh]

1. Presently pulumi resources are created with force_destroy=true. This instructs the provider to automatically delete all contents inside the resource (e.g., all objects in a bucket) before deleting the resource itself. However, this may not be desirable and should be made configurable.
2. GPU node pools are created with only a single device. This should be configurable to allow users to create multi-gpu node pools.
3. Pulumi state storage backend should be configurable to use other backends such as GCS.
4. Allow stateful handling of CLI configs instead of solely relying on env vars.
5. Allow CLI config updates via the CLI itself.