proposal: crypto/tls: Support AEGIS (for TLS 1.3)

[rugk]

Two AEGIS algorithms have been added to the IANA registry and will be supported in TLS 1.3. AEGIS is a new authenticated encryption algorithm that provides better performance and better practical security.

from the Bulletproof TLS Newsletter 2022-12-29

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So given caddy e.g. has a history of adapting new TLS changes, maybe that should be a thing to adopt. (AEAD_AEGIS128L and AEAD_AEGIS256 as ciphers)

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copied from caddyserver/caddy#5345

[seankhliao]

This should wait until it is stabilized as a published RFC before we consider it.