[Feature] vllm wrapper

[vmoens]

Stack from ghstack (oldest at bottom):

• [Tutorial] LLM integration #2832
• -> [Feature] vllm wrapper #2830
• [Feature] transformers policy #2825
• [Feature] batch_size, reward, done, attention_key in LLMEnv #2824
• [Feature] DensifyReward postproc #2823
• [Feature] DataLoadingPrimer.repeat #2822

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2830

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❌ 6 New Failures, 14 Pending

As of commit 4e44ff8 with merge base 6e40548 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/rl / wheel-py3_9-cuda11_8 (gh)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / wheel-py3_9-cuda12_6 (gh)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / wheel-py3_9-cuda12_8 (gh)
  Process completed with exit code 1.
• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 2.
• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 22ef87b22b3fe417b1d272e744b5eeeb5cf8bbc428ae689a220fa335d88d8140 /exec failed with exit code 1
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t a96b25c41d45b2dbe58ed6304be92234f2b5c7710d44f5a62f0237ffc34b8175 /exec failed with exit code 1

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