Implement SerializableState for hashes #1035

Job	Run time
cross (1.72.0, aarch64-unknown-linux-gnu, default)	44s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	41s
cross (stable, aarch64-unknown-linux-gnu, default)	41s
cross (stable, powerpc-unknown-linux-gnu, default)	50s
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	3s
build (1.72.0, thumbv7em-none-eabi)	22s
build (1.72.0, wasm32-unknown-unknown)	21s
build (1.72.0, loongarch64-unknown-linux-gnu)	25s
build (stable, thumbv7em-none-eabi)	34s
build (stable, wasm32-unknown-unknown)	20s
build (stable, loongarch64-unknown-linux-gnu)	14s
linux (x86_64-unknown-linux-gnu, 1.72.0)	37s
linux (x86_64-unknown-linux-gnu, stable)	36s
macos (1.72.0)	37s
macos (stable)	31s
windows (x86_64-pc-windows-gnu, 1.72.0)	52s
windows (x86_64-pc-windows-gnu, stable)	1m 56s
	11m 0s

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