crypto: add signDigest/verifyDigest and Ed25519ctx support #4509

Job	Run time
Build slim tarball	2m 32s
x86_64-linux: with shared libraries	21m 48s
aarch64-darwin: with shared libraries	19m 11s
aarch64-linux: with shared libraries	17m 18s
x86_64-darwin: with shared libraries	42m 44s
	1h 43m 33s

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