Add XChaCha20Engine and XChaCha20Poly1305 #957
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This PR adds an implementation of IETF draft XChaCha20 and XChaCha20Poly1305 (https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha). The implementation was inspired by the XSalsa20 implementation.
Fixes #631