Add HTTP control server for cell suspend/resume and fault injection#1452
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Adds the FastAPI control server (server.py: _create_control_app / start_control_server) exposing a k8s-style cell API, backed by a cell registry (registry.py: _CellRegistry) and per-cell handles (handles.py: _ActorCellHandle / _RolloutCellHandle wrapping the RayTrainGroup and rollout manager) so an external operator (or the e2e fault injector) can list cells, suspend/resume them, and inject faults. Includes the fast unit tests for server, registry, and handles. The Pydantic API models live in the separate control_server/models module.
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Adds the FastAPI control server (server.py: _create_control_app / start_control_server) exposing a k8s-style cell API, backed by a cell registry (registry.py: _CellRegistry) and per-cell handles (handles.py: _ActorCellHandle / _RolloutCellHandle wrapping the RayTrainGroup and rollout manager) so an external operator (or the e2e fault injector) can list cells, suspend/resume them, and inject faults. Includes the fast unit tests for server, registry, and handles. The Pydantic API models live in the separate control_server/models module.