vPSBT: add sighash support (no version bump) #2200

Job	Run time
Format check	25s
Docker build check	2m 47s
Compilation check	28s
cross compilation	8m 29s
run itests	9m 30s
run itests postgres	15m 19s
Lint check	2m 0s
go mod check	38s
RPC check	1m 8s
Sqlc check	19s
test vector check	55s
run unit tests (unit-race)	5m 21s
run unit tests (unit-cover)	2m 47s
run unit tests (unit dbbackend=postgres)	4m 2s
	54m 8s

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