[3/3]: Implement `Consumer` on `chainWatcher` and resolvers #452

Job	Run time
Sqlc check	2m 51s
check commits	31m 49s
cross compilation	31m 42s
RPC and mobile compilation check	4m 36s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
lint code	6m 43s
sample configuration check	6m 14s
run unit tests (btcd unit-cover)	5m 46s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run unit tests (unit tags="kvdb_etcd")	18m 30s
run macOS itest	34m 14s
run unit tests (unit tags="kvdb_postgres")	17m 35s
check release notes updated	4s
run ubuntu itests (btcd, backend=btcd cover=1)	22m 17s
run unit tests (unit tags="kvdb_sqlite")	15m 52s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	30m 9s
run unit tests (btcd unit-race)	35m 35s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	30m 6s
run windows itest	6m 12s
run unit tests (unit-module)	3m 30s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	29m 52s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	41m 28s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	51m 42s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	31m 49s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	50m 45s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	31m 30s
run ubuntu itests (neutrino, backend=neutrino cover=1)	26m 43s
finish	10s
	9h 27m 52s

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