password-hash: add `Base64ShaCrypt` #1986

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 38s
build (1.56.0, wasm32-unknown-unknown)	3m 38s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	17s
test (1.56.0)	3m 56s
test (stable)	23s
minimal-versions / minimal-versions	1m 6s
	13m 18s

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