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

[yyforyongyu]

!lightninglabs-deploy mute

[Roasbeef]

Unit test failure:

        	            				/home/runner/work/lnd/lnd/lnwire/serialized_size_test.go:17
        	Error:      	Should be true
        	Test:       	TestSerializedSize
        	Messages:   	message type DynCommit does not implement SizeableMessage
FAIL
FAIL	github.com/lightningnetwork/lnd/lnwire	297.128s

[Roasbeef]

LGTM 🫕