Add basic RPC metrics via `mc support top rpc` #4812

Job	Run time
vetchecks	1m 57s
Test on Go 1.22.x and ubuntu-latest	2m 12s
Test on Go 1.22.x and macos-latest	1m 42s
Test on Go 1.22.x and windows-latest	2m 22s
	8m 13s

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