Rust

Merge pull request #2119 from subspace/parallelize-pos-proof-generation #2517

Job	Run time
cargo-fmt	49s
cargo-clippy (self-hosted, ubuntu-20.04-x86-64)	6m 32s
cargo-docs	4m 52s
cargo-clippy (self-hosted, macos-12-arm64)	10m 10s
cargo-test (self-hosted, ubuntu-20.04-x86-64)	16m 17s
cargo-clippy (self-hosted, windows-server-2022-x86-64)	20m 9s
cargo-test (self-hosted, macos-12-arm64)	21m 51s
cargo-test (self-hosted, windows-server-2022-x86-64)	39m 29s
	2h 0m 9s

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