invoices: migrate KV invoices to native SQL for users of KV SQL backends #16661

Job	Run time
check commits	8m 12s
lint code	3m 58s
Sqlc check	22s
RPC and mobile compilation check	2m 7s
sample configuration check	49s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
cross compilation	8m 3s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
run unit tests (btcd unit-cover)	8m 12s
run unit tests (unit tags="kvdb_etcd")	8m 1s
run unit tests (unit tags="kvdb_postgres")	7m 54s
run macOS itest	8m 6s
check release notes updated	3s
run unit tests (unit tags="kvdb_sqlite")	7m 53s
run unit tests (btcd unit-race)	8m 2s
run unit tests (unit-module)	1m 7s
run ubuntu itests (btcd, backend=btcd cover=1)	1s
run windows itest	6m 55s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	7m 4s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	5m 49s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	1s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	6m 52s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	3m 57s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	1s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	36s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	1s
run ubuntu itests (neutrino, backend=neutrino cover=1)	1s
finish	9s
	1h 44m 26s

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