Add a generic crypto.Hash template function returning the hex-encoded
checksum of a string using one of md5, sha1, sha256 (default), sha384 or
sha512. The supported algorithms match those used for the SRI hash in
.Data.Integrity on fingerprinted resources, so an SRI hash can be built
by composing with encoding.HexDecode and encoding.Base64Encode.
Fixes#15072
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Bjørn Erik Pedersen