crypto: add signDigest/verifyDigest and Ed25519ctx support #4548

Job	Run time
Build slim tarball	2m 0s
aarch64-darwin: with shared libraries	17m 12s
x86_64-darwin: with shared libraries	37m 59s
x86_64-linux: with shared libraries	23m 22s
aarch64-linux: with shared libraries	18m 43s
	1h 39m 16s

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