multiverse: add overlay points for universe trees #1913

Job	Run time
Format check	20s
Docker build check	2m 46s
cross compilation	8m 24s
Compilation check	25s
run itests	1m 46s
run itests postgres	1m 57s
Lint check	1m 58s
go mod check	23s
RPC check	1m 12s
Sqlc check	16s
test vector check	51s
run unit tests (unit-race)	4m 27s
run unit tests (unit-cover)	2m 1s
run unit tests (unit dbbackend=postgres)	3m 6s
	29m 52s

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