password-hash: add `Base64ShaCrypt` #1689

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 41s
minimal-versions	36s
build (1.56.0, wasm32-unknown-unknown)	3m 36s
test (1.56.0)	4m 42s
build (stable, thumbv7em-none-eabi)	24s
test (stable)	21s
build (stable, wasm32-unknown-unknown)	18s
	13m 38s

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