password-hash: add `Base64ShaCrypt` #1611

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 18s
build (1.65.0, wasm32-unknown-unknown)	4m 19s
build (stable, thumbv7em-none-eabi)	17s
clippy	3m 39s
minimal-versions	34s
test (1.65.0)	4m 36s
build (stable, wasm32-unknown-unknown)	22s
test (stable)	28s
	18m 33s

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