crypto-common: rename `serializable_state` module to `hazmat` #1960

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 36s
build (1.65.0, wasm32-unknown-unknown)	2m 32s
minimal-versions	34s
test (1.65.0)	2m 37s
test (stable)	22s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	20s
	9m 12s

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