Add enhanced prometheus metrics for tapd #1920

Job	Run time
Format check	18s
Compilation check	23s
cross compilation	8m 18s
Docker build check	2m 42s
run itests	9m 22s
run itests postgres	12m 49s
Lint check	1m 46s
go mod check	25s
RPC check	55s
Sqlc check	16s
test vector check	51s
run unit tests (unit-race)	4m 34s
run unit tests (unit-cover)	2m 40s
run unit tests (unit dbbackend=postgres)	3m 37s
	48m 56s

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