Group key witness support #1447

Job	Run time
Format check	35s
Compilation check	47s
cross compilation	15m 13s
Docker build check	4m 5s
run itests	8m 1s
run itests postgres	11m 34s
Lint check	2m 50s
go mod check	37s
RPC check	1m 33s
Sqlc check	34s
test vector check	1m 20s
run unit tests (unit-race)	6m 19s
run unit tests (unit-cover)	3m 56s
run unit tests (unit dbbackend=postgres)	4m 22s
	1h 1m 46s

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