[Experimental!] Add UDP X25519 auth and AES256-GCM AEAD#54

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utoni wants to merge 10 commits intomainfrom add/udp-aes256-gcm

+1,464-46

Commits on Feb 1, 2025

Added preps for AAD/KeyEx
utoni
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Commits on Feb 4, 2025

Added HKDF to uniform distirbute a X25519 shared key
utoni
committed

Commits on Feb 24, 2025

Added preps for different packet types + AAD (type+size)
utoni
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