[Refactor] vLLMWrapper class

[vmoens]

Stack from ghstack (oldest at bottom):

• [Refactor] TransformersWrapper class #2871
• -> [Refactor] vLLMWrapper class #2870

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2870

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❌ 14 New Failures, 8 Unrelated Failures

As of commit b6e9801 with merge base 7df8317 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/rl / build-wheel-py3_9-cpu (gh)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / upload / upload-wheel-py3_9-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cpu_
• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 7327b0574dbd56366068752b5285434c6ee43080f9f9ff6f478d70455a96990c /exec failed with exit code 1
• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t e05b11f240346cdccd14cc348607ca10ef0388bd20f3c8b0b28054c0b860b254 /exec failed with exit code 247
• SOTA Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 259a4496880a7cb282ab61662e63764bb7d9acaed43deab6ae391d2ba8e0c703 /exec failed with exit code 1
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh)
  test/test_modules.py::TestMultiAgent::test_multiagent_mlp_lazy
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh)
  test/test_tensordictmodules.py::TestTDSequence::test_stateful[True-bounded-False]
• Unit-tests on Linux / tests-cpu (3.12) / linux-job (gh)
  test/test_tensordictmodules.py::TestTDSequence::test_stateful_probabilistic[True-bounded-False]
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh)
  test/test_tensordictmodules.py::TestTDModule::test_stateful[True-bounded-False]
• Unit-tests on Linux / tests-gpu (3.11, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 1d37e90f92917548eae4a5acf2516956cb54e32a75db8eee644d6fa57943ae2f /exec failed with exit code 250
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 8ad3c063bab704e770ca43a18d676c10c822771ace58401810ce6c188985cc9c /exec failed with exit code 1
• Unit-tests on Linux / tests-optdeps (3.11, 12.8) / linux-job (gh)
  test/test_modules.py::TestMultiAgent::test_multiagent_mlp_lazy

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Windows Wheels / pytorch/rl / build-wheel-py3_9-cuda11_8 (gh) (trunk failure)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / build-wheel-py3_9-cuda12_6 (gh) (trunk failure)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / build-wheel-py3_9-cuda12_8 (gh) (trunk failure)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/rl / upload / upload-wheel-py3_9-cuda11_8 (gh) (trunk failure)
• Build Windows Wheels / pytorch/rl / upload / upload-wheel-py3_9-cuda12_6 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cu126_
• Build Windows Wheels / pytorch/rl / upload / upload-wheel-py3_9-cuda12_8 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cu128_
• Unit-tests on Linux / tests-stable-gpu (3.10, 11.8) / linux-job (gh) (trunk failure)
  test/test_transforms.py::TestTimer::test_transform_model
• Unit-tests on Windows / unittests-cpu (3.10, windows.4xlarge, cpu) / windows-job (gh) (trunk failure)
  test/test_transforms.py::TestTimer::test_transform_env

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