[Feature] Add group_map support to MLAgents wrappers

[kurtamohler]

Description

Adds the group_map argument to UnityMLAgentsWrapper and UnityMLAgentsEnv.

Motivation and Context

Close #2490

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• New feature (non-breaking change which adds core functionality)
• Documentation (update in the documentation)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

cc @matteobettini

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2491

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 6 New Failures, 9 Unrelated Failures

As of commit c57d1d9 with merge base ec04c35 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  /home/runner/work/_temp/26a65bb0-cff1-4190-b532-6d68653f5009.sh: line 5: 2410 Bus error (core dumped) $RUN_BENCHMARK /tmp/tmp.tiq3kAOGdw
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Process completed with exit code 135.
• Continuous Benchmark / GPU Pytest benchmark (gh)
  Fatal Python error: Fatal Python error: Fatal Python error: Fatal Python error: Bus errorBus error
• Examples Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t eb0d1c9c747c6e1df5759fbb53a261773d419aaaddd6c12a6d9f0f8b4e886a2f /exec failed with exit code 1
• Habitat Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 8b7cb87f06632e6409ea98c3db90b1e66792a0ea86499f221e1418af61ae8778 /exec failed with exit code 134
• Libs Tests on Linux / unittests-pettingzoo / linux-job (gh)
  RuntimeError: Command docker exec -t c8d7c4dfb91d3a6bc30a26be9ab08b5dc58733aeb3c15e0ff164f9b3f86f314b /exec failed with exit code 2

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 / upload / wheel-py3_9-cpu (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda11_8 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_1 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_4 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Continuous Benchmark / CPU Pytest benchmark (gh) (trunk failure)
  ##[error]Process completed with exit code 135.
• Libs Tests on Linux / unittests-jumanji (3.9, 12.1) / linux-job (gh) (trunk failure)
  test/test_libs.py::TestJumanji::test_jumanji_rendering[batch_size1-RubiksCube-v0]
• Libs Tests on Linux / unittests-robohive (3.9, 12.1) / linux-job (gh) (trunk failure)
  test/test_libs.py::TestRoboHive::test_robohive[franka_slide_random-v3-True-True]
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh) (trunk failure)
  test/test_modules.py::TestMultiAgent::test_multiagent_mlp_tdparams[True-batch0-6-True-True-3]
• Unit-tests on Windows / unittests-cpu / windows-job (gh) (trunk failure)
  test/test_collector.py::TestCompile::test_compiled_policy[device0-compile_policy2-MultiSyncDataCollector]

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[vmoens]

Super useful
LGTM thanks!