password-hash: add `Base64ShaCrypt` #2055

Job	Run time
build (1.57.0, thumbv7em-none-eabi)	3m 38s
build (1.57.0, wasm32-unknown-unknown)	3m 49s
test (1.57.0)	4m 32s
build (stable, thumbv7em-none-eabi)	18s
test (stable)	33s
build (stable, wasm32-unknown-unknown)	25s
minimal-versions / minimal-versions	1m 45s
	15m 0s

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