Improve client SDK's missing parts and mistakes

[achimnol]

There are several issues found when I tried to use the client SDK for model services and @leksikov tried to write Helmsman training dataset for the model service CLI.

Regarding #3202, there is a general problem with existing ComputeSession and InferenceSession classes with from_session_id() classmethod. Since the instance returned by from_session_id() does not have any other valid attributes before making an actual GET /session/{session_name_or_id} manager API request, trying to access .service_ports, .session_name would fail. As they are just plain self attributes and we cannot make property methods asynchronous, we should add an explicit async method to fill the instance attributes.

Related pull requests

• fix: improper variable declaration position on service creation SDK #2806