Implement `blockbeat` #16934

Job	Run time
Sqlc check	45s
RPC and mobile compilation check	3m 16s
lint code	6m 18s
check commits	49m 8s
cross compilation	30m 36s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
sample configuration check	1m 37s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	1m 34s
run unit tests (btcd unit-cover)	19m 39s
run windows itest	7m 25s
run unit tests (unit tags="kvdb_etcd")	21m 10s
run macOS itest	28m 29s
run unit tests (unit tags="kvdb_postgres")	19m 31s
check release notes updated	7s
run unit tests (unit tags="kvdb_sqlite")	19m 6s
run unit tests (btcd unit-race)	40m 24s
run unit tests (unit-module)	1m 8s
run ubuntu itests (btcd, backend=btcd cover=1)	19m 3s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	24m 30s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	23m 20s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	24m 48s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	32m 47s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	42m 50s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	25m 47s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	27m 4s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	24m 40s
run ubuntu itests (neutrino, backend=neutrino cover=1)	22m 18s
finish	12s
	8h 37m 36s

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