[Feature] ConditionalPolicySwitch transform

[vmoens]

Stack from ghstack (oldest at bottom):

• #2763
• -> #2711
• #2709

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2711

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:x: 3 New Failures, 2 Pending, 3 Unrelated Failures

As of commit 9ef0981c3970af0c5dec67e9c0365892d29d4f03 with merge base 1813e8edb835dbef17e2798d4d42af0104eae4da ():

NEW FAILURES - The following jobs have failed:

• 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 ad2a6738f3c4dd2fd3e825bbe9b0a4e2ef90a6f508f5aeca6caffafa23621ec1 /exec failed with exit code 1
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh) test/test_transforms.py::TestVecNorm::test_vecnorm_parallel_auto[5]

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

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

• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh) (trunk failure) test/test_libs.py::TestGym::test_gym_fake_td[True-False-3-HalfCheetah-v2]
• Unit-tests on Linux / tests-olddeps (3.9, 11.6) / linux-job (gh) (trunk failure) test/test_transforms.py::TestActionDiscretizer::test_transform_env[cheetah-SamplingStrategy.RANDOM-False-True]
• 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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