DynComms [2/n]: lnwire: add authenticated wire messages for Dyn*

[ProofOfKeags]

Change Description

This PR updates the dynamic commitment wire messages to include the new authentication mechanisms.

Stacked on #8270 but does not depend on it.

Steps to Test

TODO: write tests to ensure signing, verification and message composition and decomposition work properly

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[Roasbeef]

Why not combine all the serialization into a single message for the SigDigest? We do something similar for the gossip messages.

[Roasbeef]

LGTM 🎎

[lightninglabs-deploy]

@Crypt-iQ: review reminder