DynComms [2/n]: lnwire: add authenticated wire messages for Dyn* #16699

Job	Run time
lint code	6m 19s
RPC and mobile compilation check	3m 30s
cross compilation	30m 44s
check commits	18m 28s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	7s
sample configuration check	1m 51s
Sqlc check	2m 51s
run unit tests (btcd unit-cover)	19m 44s
run unit tests (unit tags="kvdb_etcd")	21m 12s
run windows itest	0s
run unit tests (unit tags="kvdb_postgres")	19m 32s
run unit tests (unit tags="kvdb_sqlite")	18m 37s
run unit tests (btcd unit-race)	3h 40m 1s
check release notes updated	0s
run macOS itest	0s
run unit tests (unit-module)	1m 6s
run ubuntu itests	0s
finish	5s
	6h 4m 13s

Provide feedback