server:add querystats sync to follower pd

[qidi1]

Signed-off-by: qidi1 [email protected]

What problem does this PR solve?

In PD now, QueryStat data is not synchronized and we can't get QueryStat data in non-leader nodes

Issue Number: #pingcap/tidb-dashboard/issues/1209

What is changed and how does it work?

add querystats sync to fllower pd 

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

• Has persistent data change

Side effects

• Possible performance regression

Related changes

• server:return qps data to tidbdashborad  #4921
• proto:add querystat in SyncRegionResponse  pingcap/kvproto#914
• add QPS in tidb_dashboard ref:#1209 pingcap/tidb-dashboard#1252

Release note

None

Manual test

We ran a small cluster locally. On the cluster, test data was generated using the tiup bench tool. The results are shown in the figure below.

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[nolouch]

Can it merge to hasStats?

[nolouch]

Can queryStats be merge into ReginStats?

[ti-chi-bot]

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[ti-chi-bot]

PR needs rebase.

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