invoices: migrate KV invoices to native SQL for users of KV SQL backends #15845

Job	Run time
check commits	10m 48s
Sqlc check	35s
lint code	3m 43s
RPC and mobile compilation check	2m 19s
cross compilation	11m 39s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
sample configuration check	55s
run ubuntu itests (btcd, backend=btcd cover=1)	29m 50s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	38m 0s
run unit tests (btcd unit-cover)	18m 8s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	38m 9s
run unit tests (unit tags="kvdb_etcd")	20m 12s
run windows itest	38m 57s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	39m 29s
run unit tests (unit tags="kvdb_postgres")	19m 32s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	53m 29s
run unit tests (unit tags="kvdb_sqlite")	17m 47s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 12m 44s
run unit tests (btcd unit-race)	36m 23s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	41m 37s
run unit tests (unit-module)	1m 1s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 14m 48s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	40m 54s
run ubuntu itests (neutrino, backend=neutrino cover=1)	36m 21s
run macOS itest	48m 37s
check release notes updated	5s
finish	5s
	11h 36m 17s

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