password-hash: add `Base64ShaCrypt` #1992

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	3m 46s
build (1.56.0, wasm32-unknown-unknown)	4m 37s
test (1.56.0)	3m 45s
test (stable)	29s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	23s
minimal-versions / minimal-versions	59s
	14m 21s

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