executor: Add TiKV read throughput metric (#28701)#28913

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ti-srebot wants to merge 2 commits intopingcap:release-5.2from ti-srebot:release-5.2-38f05d1f4bc2

+17-14

Commits on Oct 18, 2021

cherry pick pingcap#28701 to release-5.2

jyz0309
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ti-srebot
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fix conflict
jyz0309
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