password-hash: add `Base64ShaCrypt` #1546

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	3m 52s
minimal-versions	54s
build (1.60.0, wasm32-unknown-unknown)	3m 40s
test (1.60.0)	3m 46s
build (stable, thumbv7em-none-eabi)	11s
test (stable)	39s
build (stable, wasm32-unknown-unknown)	18s
	13m 20s

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