multi: AuxComponentsProvider interface #835

Job	Run time
cross compilation	30m 44s
lint code	4m 50s
check commits	5m 8s
run macOS itest	54m 53s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
check release notes updated	4s
RPC and mobile compilation check	5m 51s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
sample configuration check	3m 49s
Sqlc check	5m 2s
run ubuntu itests (btcd, backend=btcd cover=1)	41m 0s
run unit tests (btcd unit-cover)	4m 28s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	51m 26s
run windows itest	42m 53s
run unit tests (unit tags="kvdb_etcd")	17m 33s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	51m 21s
run unit tests (unit tags="kvdb_postgres")	16m 11s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	51m 9s
run unit tests (unit tags="kvdb_sqlite")	15m 34s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 10m 43s
run unit tests (btcd unit-race)	34m 40s
run unit tests (unit-module)	3m 58s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 22m 53s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	53m 48s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 22m 39s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	53m 29s
run ubuntu itests (neutrino, backend=neutrino cover=1)	51m 20s
finish	2s
	13h 55m 37s

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