[2/3]: implement `blockbeat` #324

Job	Run time
RPC and mobile compilation check	4s
Sqlc check	3s
check commits	4s
lint code	5s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
cross compilation	4s
sample configuration check	2s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
run ubuntu itests (btcd, backend=btcd cover=1)	1s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	4s
run unit tests (btcd unit-cover)	1s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	3s
run windows itest	1s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	2s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	3s
run unit tests (unit tags="kvdb_etcd")	1s
run macOS itest	4s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	3s
run unit tests (unit tags="kvdb_postgres")	1s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	2s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	4s
run unit tests (unit tags="kvdb_sqlite")	1s
check release notes updated	3s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	1s
run unit tests (btcd unit-race)	1s
run ubuntu itests (neutrino, backend=neutrino cover=1)	1s
run unit tests (unit-module)	1s
finish	2s
	1m 10s

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