Refactor GroupKeyReveal for multi-version support #3550

Job	Run time
Format check	3m 14s
Compilation check	45s
cross compilation	4m 39s
Docker build check	3m 42s
run itests	9m 23s
run itests postgres	20m 49s
migration version check	14s
Lint check	2m 39s
RPC check	1m 18s
go mod check	3m 12s
run LiT tests	12m 32s
sample configuration check	50s
Sqlc check	5m 31s
test vector check	3m 58s
run unit tests (unit-race)	11m 22s
run unit tests (unit-cover)	4m 43s
run unit tests (unit dbbackend=postgres)	4m 22s
finish	6s
	1h 33m 19s

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