Implement `blockbeat` #16863

Job	Run time
Sqlc check	2m 44s
cross compilation	21s
check commits	11m 50s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
lint code	52s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
RPC and mobile compilation check	2m 59s
sample configuration check	1m 26s
run unit tests (btcd unit-cover)	6m 26s
run macOS itest	11m 52s
run unit tests (unit tags="kvdb_etcd")	11m 50s
run ubuntu itests (btcd, backend=btcd cover=1)	10m 30s
run unit tests (unit tags="kvdb_postgres")	11m 51s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	11m 50s
run unit tests (unit tags="kvdb_sqlite")	11m 53s
run windows itest	7m 56s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	11m 40s
run unit tests (btcd unit-race)	11m 51s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	11m 23s
run unit tests (unit-module)	1m 12s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	11m 50s
check release notes updated	4s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	11m 37s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	11m 13s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	11m 39s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	10m 55s
run ubuntu itests (neutrino, backend=neutrino cover=1)	10m 19s
finish	5s
	3h 28m 19s

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