invoices: migrate KV invoices to native SQL for users of KV SQL backends #15822

Job	Run time
check commits	6m 15s
lint code	3m 45s
cross compilation	14m 23s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
sample configuration check	49s
RPC and mobile compilation check	2m 12s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
Sqlc check	23s
run unit tests (btcd unit-cover)	5m 32s
run macOS itest	51m 2s
run unit tests (unit tags="kvdb_etcd")	19m 35s
check release notes updated	4s
run unit tests (unit tags="kvdb_postgres")	18m 20s
run unit tests (unit tags="kvdb_sqlite")	17m 29s
run ubuntu itests (btcd, backend=btcd cover=1)	31m 25s
run unit tests (btcd unit-race)	36m 48s
run windows itest	42m 18s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	41m 10s
run unit tests (unit-module)	1m 12s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	40m 41s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	41m 16s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	56m 42s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 16m 30s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	44m 29s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	2m 52s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	1m 37s
run ubuntu itests (neutrino, backend=neutrino cover=1)	38m 16s
finish	6s
	9h 55m 22s

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