[Algorithm] QGNN mixer

[matteobettini]

Value function mixer using a GNN

from https://arxiv.org/abs/2205.13005

missing:

• docs
• tests

implemented by @Acciorocketships

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1420

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✅ You can merge normally! (5 Unrelated Failures)

As of commit 314c069 with merge base ff3a350 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t f213f943923566969396812dab978f841c1fff3c3466b683c49ed9a1c3924c9e /exec failed with exit code 139
• Lint / c-source / linux-job (gh)
  RuntimeError: Command docker exec -t 499c1fd1f269bd65b726b1b714e5280c3fd9b36bd8de144290a871de5e27bde5 /exec failed with exit code 1

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

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

• Unit-tests on Windows / unittests-gpu / windows-job (gh)
  ##[error]The operation was canceled.

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