[Feature] pickle-free RB checkpointing #8457

Job	Run time
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 38s
build-wheel-mac (3.8, 3.8)	1m 37s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 38s
build-wheel-mac (3.9, 3.9)	1m 6s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 31s
build-wheel-mac (3.10, 3.10.3)	3m 8s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 31s
build-wheel-mac (3.11, 3.11)	2m 5s
build-wheel-windows (3.8, 3.8)	2m 51s
build-wheel-windows (3.9, 3.9)	2m 51s
build-wheel-windows (3.10, 3.10.3)	4m 40s
build-wheel-windows (3.11, 3.11)	2m 53s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 11s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 24s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 16s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 3s
test-wheel (mac, macos-latest, 3.8)	4m 54s
test-wheel (mac, macos-latest, 3.9)	2m 30s
test-wheel (mac, macos-latest, 3.10)	2m 18s
test-wheel (mac, macos-latest, 3.11)	2m 14s
test-wheel-windows (3.8)	3m 54s
test-wheel-windows (3.9)	4m 44s
test-wheel-windows (3.10)	3m 52s
test-wheel-windows (3.11)	4m 4s
	1h 4m 53s

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