Beat [3/4]: prepare resolvers to handle the `blockbeat` #16866

Job	Run time
check commits	45m 31s
RPC and mobile compilation check	3m 3s
cross compilation	30m 24s
lint code	6m 30s
sample configuration check	1m 36s
Sqlc check	21s
run unit tests (btcd unit-cover)	19m 22s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
run unit tests (unit tags="kvdb_etcd")	20m 35s
run ubuntu itests	0s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
run unit tests (unit tags="kvdb_postgres")	19m 39s
run unit tests (unit tags="kvdb_sqlite")	17m 58s
run windows itest	0s
run macOS itest	0s
run unit tests (btcd unit-race)	39m 40s
run unit tests (unit-module)	1m 2s
check release notes updated	0s
finish	4s
	3h 25m 56s

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