crypto-common: rename `serializable_state` module to `hazmat` #2316

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	16s
test (1.71.0)	25s
build (1.71.0, wasm32-unknown-unknown)	21s
test (stable)	15s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	12s
	1m 41s

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