crypto: add crypto.signDigest() and crypto.verifyDigest() methods #4512

Job	Run time
Build slim tarball	1m 57s
x86_64-darwin: with shared libraries	38m 0s
x86_64-linux: with shared libraries	21m 0s
aarch64-linux: with shared libraries	17m 30s
aarch64-darwin: with shared libraries	18m 14s
	1h 36m 41s

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