[Feature] UnaryTransform for input entries

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature,Refactor] Chess improvements: fen, pgn, pixels, san #2702
• -> [Feature] UnaryTransform for input entries #2700
• [BugFix] patch rand_action in TransformedEnv to read the base_env method #2699
• [Feature] example_data for NonTensor spec #2698

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2700

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❌ 4 New Failures, 7 Pending, 3 Unrelated Failures

As of commit f70bc1b with merge base 256a700 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda11_8 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cu118_
• 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.
• Unit-tests on Windows / unittests-cpu / windows-job (gh)
  Process completed with exit code 1.

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)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cpu_
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_4 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.9_cu124_
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_6 (gh) (trunk failure)

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[vmoens]

@kurtamohler this is very much WIP - no need to review now