Migrate single-step SPMD RL trainer from //third_party/py/maxrl/trainer/ to //third_party/py/maxtext/src/maxtext/training_engine/, preserving full file revision history via Piper integration.#4574
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Migrate single-step SPMD RL trainer from //third_party/py/maxrl/trainer/ to //third_party/py/maxtext/src/maxtext/training_engine/, preserving full file revision history via Piper integration.