docs: add pytorch integration guide. #432

Job	Run time
Cargo Machete	1m 3s
determine changes	6s
pre-commit	43s
cargo test \| ubuntu	3m 30s
cargo test \| macos aarch64	1s
cargo rustdoc \| ubuntu	58s
cargo test \| windows	3m 23s
cargo fmt \| ubuntu	18s
cargo clippy \| ubuntu	45s
build binary \| linux x86_64	2m 26s
build binary \| macos aarch64	1s
build binary \| macos x86_64	0s
build binary \| windows aarch64	1m 34s
build binary \| windows x86_64	3m 17s
cargo test \| macos x86_64	0s
pytest integration \| linux x86_64	58s
Integration tests \| linux x86_64	1s
Downstream tests \| linux x86_64	58s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1s
test wheel installation \| macos aarch64	1s
pytest integration \| macos aarch64	1s
pytest integration \| macos aarch64	1s
Downstream tests \| macos aarch64	1s
Integration tests \| windows x86_64	1s
Downstream tests \| windows x86_64	1s
pytest integration \| windows x86_64	1s
test wheel installation \| windows x86_64	1s
	20m 11s

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