fn: add goroutine manager #15898

Job	Run time
lint code	3m 3s
RPC and mobile compilation check	1m 56s
check commits	4m 2s
cross compilation	31m 15s
sample configuration check	40s
Sqlc check	48s
run ubuntu itests (btcd, backend=btcd cover=1)	28m 58s
run unit tests (btcd unit-cover)	17m 16s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	38m 7s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
run unit tests (unit tags="kvdb_etcd")	19m 56s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	37m 22s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	37m 27s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	52m 55s
run unit tests (unit tags="kvdb_postgres")	18m 3s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 11m 11s
run macOS itest	47m 34s
run unit tests (unit tags="kvdb_sqlite")	17m 29s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	40m 9s
run unit tests (btcd unit-race)	36m 29s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 14m 55s
run unit tests (unit-module)	1m 1s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	40m 50s
check release notes updated	6s
run ubuntu itests (neutrino, backend=neutrino cover=1)	35m 30s
run windows itest	33m 53s
finish	5s
	11h 31m 9s

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