[Feature,Doc] `get_stateful_net` and document loss initialization #125

Job	Run time
generate-matrix / generate	5s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-cpu	8m 46s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-cuda11_8	11m 0s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-cuda12_1	11m 50s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-cuda12_4	11m 15s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-rocm6_0	13m 46s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / manywheel-py3_8-rocm6_1	15m 10s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-cpu	35s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-cuda11_8	34s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-cuda12_1	36s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-cuda12_4	26s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-rocm6_0	28s
pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl) / upload / manywheel-py3_8-rocm6_1	28s
	1h 14m 59s

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