[2/3]: implement `blockbeat` #451

Job	Run time
RPC and mobile compilation check	5m 3s
Sqlc check	5m 24s
check commits	32m 48s
cross compilation	32m 6s
check pinned dependencies (google.golang.org/grpc v1.59.0)	3s
lint code	6m 44s
sample configuration check	4m 0s
run unit tests (btcd unit-cover)	16m 4s
run unit tests (unit tags="kvdb_etcd")	18m 15s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
run unit tests (unit tags="kvdb_postgres")	17m 27s
run macOS itest	34m 58s
run unit tests (unit tags="kvdb_sqlite")	16m 3s
run unit tests (btcd unit-race)	35m 41s
check release notes updated	4s
run unit tests (unit-module)	3m 30s
run ubuntu itests (btcd, backend=btcd cover=1)	22m 15s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	30m 42s
run windows itest	5m 36s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	28m 52s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	30m 17s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	41m 43s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	52m 33s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	31m 19s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	52m 52s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	31m 33s
run ubuntu itests (neutrino, backend=neutrino cover=1)	26m 37s
finish	4s
	9h 42m 37s

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