Improve clarity on asset mint and universe stats RPC responses #1521

Job	Run time
RPC check	1m 28s
Format check	39s
cross compilation	5m 5s
Docker build check	4m 8s
Lint check	2m 58s
go mod check	1m 17s
Sqlc check	27s
test vector check	1m 8s
run unit tests (unit-race)	5m 58s
run itests	1m 1s
run itests postgres	45s
run unit tests (unit-cover)	2m 3s
run unit tests (unit dbbackend=postgres)	6m 52s
Compilation check	51s
	34m 40s

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