[multiverse RPC]: add better universe root node cache #3344

Job	Run time
go mod check	20s
go mod check	20s
RPC check	1m 21s
RPC check	1m 21s
Format check	20s
Format check	20s
Docker build check	13s
Docker build check	3m 33s
Compilation check	1m 39s
Compilation check	1m 39s
cross compilation	11m 53s
cross compilation	11m 53s
Lint check	2m 37s
Lint check	2m 37s
Sqlc check	28s
Sqlc check	28s
sample configuration check	43s
sample configuration check	43s
test vector check	52s
test vector check	52s
migration version check	12s
migration version check	12s
run itests	10m 37s
run itests	10m 37s
run itests postgres	19m 2s
run itests postgres	19m 2s
run LiT tests	13m 2s
run LiT tests	13m 2s
run unit tests (unit-race)	8m 55s
run unit tests (unit-race)	8m 55s
run unit tests (unit-cover)	4m 23s
run unit tests (unit-cover)	4m 23s
run unit tests (unit dbbackend=postgres)	5m 44s
run unit tests (unit dbbackend=postgres)	5m 44s
finish	5s
finish	5s
	2h 48m 12s

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