invoices: migrate KV invoices to native SQL for users of KV SQL backends #16832

Job	Run time
check commits	19m 28s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
cross compilation	31m 30s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	5s
lint code	9m 32s
run macOS itest	45m 29s
check release notes updated	3s
RPC and mobile compilation check	1m 34s
sample configuration check	4m 24s
Sqlc check	5m 3s
run ubuntu itests (btcd, backend=btcd cover=1)	35m 2s
run unit tests (btcd unit-cover)	22m 3s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	40m 51s
run windows itest	17m 25s
run unit tests (unit tags="kvdb_etcd")	23m 56s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 58s
run unit tests (unit tags="kvdb_postgres")	22m 41s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	41m 10s
run unit tests (unit tags="kvdb_sqlite")	22m 43s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	45m 25s
run unit tests (btcd unit-race)	45m 14s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	45m 26s
run unit tests (unit-module)	3m 38s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	42m 37s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	45m 27s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	42m 25s
run ubuntu itests (neutrino, backend=neutrino cover=1)	39m 14s
finish	6s
	11h 32m 33s

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