Group key witness support #1437

Job	Run time
Compilation check	48s
Docker build check	5m 45s
cross compilation	15m 13s
Format check	38s
run itests	7m 13s
run itests postgres	9m 4s
Lint check	3m 4s
go mod check	39s
RPC check	1m 54s
Sqlc check	34s
test vector check	1m 46s
run unit tests (unit-race)	6m 5s
run unit tests (unit-cover)	4m 36s
run unit tests (unit dbbackend=postgres)	4m 25s
	1h 1m 44s

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