docs: add pytorch integration guide. (#2711) #436

Job	Run time
Cargo Machete	59s
determine changes	8s
pre-commit	46s
build binary \| windows aarch64	4m 15s
build binary \| macos x86_64	7m 59s
build binary \| linux x86_64	2m 3s
build binary \| macos aarch64	3m 33s
build binary \| windows x86_64	3m 19s
cargo test \| ubuntu	6m 35s
cargo test \| macos aarch64	9m 11s
cargo test \| macos x86_64	15m 48s
cargo test \| windows	10m 20s
cargo rustdoc \| ubuntu	55s
cargo fmt \| ubuntu	14s
cargo clippy \| ubuntu	46s
Pytest \| linux x86_64	1m 7s
Integration tests \| linux x86_64	6m 3s
Downstream tests \| linux x86_64	4m 26s
Wheel Tests \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 56s
Integration tests \| windows x86_64	5m 39s
Downstream tests \| windows x86_64	4m 27s
Pytest \| windows x86_64	5m 34s
Wheel Tests \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	2m 48s
Downstream tests \| macos aarch64	50s
Integration tests \| macos aarch64	4m 59s
Pytest \| macos aarch64	1m 37s
Wheel Tests \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	1m 44s
	1h 48m 1s

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