[Feature] Add support for Unity MLAgents environments #10261

Job	Run time
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 43s
build-wheel-windows (3.8, 3.8)	3m 25s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 35s
build-wheel-windows (3.9, 3.9)	3m 5s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 42s
build-wheel-windows (3.10, 3.10.3)	3m 10s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 45s
build-wheel-windows (3.11, 3.11)	2m 10s
test-wheel (linux, ubuntu-20.04, 3.8)	4m 59s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 22s
test-wheel (linux, ubuntu-20.04, 3.10)	11m 24s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 19s
test-wheel-windows (3.8)	4m 37s
test-wheel-windows (3.9)	5m 29s
test-wheel-windows (3.10)	4m 3s
test-wheel-windows (3.11)	4m 10s
	57m 58s

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