feat: add runtimes service and rescue mode support to VmClient

[aliel]

No description provided.

[foxpatch-aleph]

The PR adds a new runtimes service and rescue mode support. However, there is a critical bug in runtimes.py line 55 where aggregate.runtimes is referenced but the field is actually named entries. Additionally, the enter_rescue method uses params for passing runtime_id while other similar operations (like restore_from_volume) use json_data for consistency.

src/aleph/sdk/client/services/runtimes.py (line 55): BUG: References aggregate.runtimes but the field in RuntimesAggregate is named entries (line 26). This will cause an AttributeError at runtime. Change to aggregate.entries.

src/aleph/sdk/client/vm_client.py (line 308): INCONSISTENCY: Uses params to pass runtime_id, but similar operations like restore_from_volume (lines 295-300) use json_data for request payloads. For consistency, consider changing to json_data={"runtime_id": runtime_id} if runtime_id else None.

src/aleph/sdk/client/services/runtimes.py (line 57): The get_default_runtime method requires runtime_type to be a non-optional str, but the docstring example shows it could be "rescue" or "instance". Consider adding a type hint or Enum for valid runtime types to help callers.

[github-actions]

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