Implement PrevId[] UTXO selection for FundVirtualPSBT RPC method; valid for single PrevId at first #3515

Job	Run time
cross compilation	4m 22s
Format check	21s
Docker build check	3m 45s
Compilation check	38s
run itests	9m 26s
run itests postgres	17m 32s
Lint check	2m 30s
migration version check	12s
go mod check	23s
RPC check	1m 25s
run LiT tests	12m 24s
sample configuration check	35s
Sqlc check	35s
test vector check	48s
run unit tests (unit-race)	11m 33s
run unit tests (unit-cover)	2m 47s
run unit tests (unit dbbackend=postgres)	6m 1s
finish	4s
	1h 15m 21s

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