[fix #740] Add more logs in getregionstore

[shiyuhang0]

What problem does this PR solve?

Issue Number: close #750

Problem Description: TBD

What is changed and how does it work?

• Add more logs

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has methods of interface change
• Has persistent data change
• No code

Check List for Tests

This PR has been tested by at least one of the following methods:

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Possible performance regression, WHY: TBD
• Increased code complexity, WHY: TBD
• Breaking backward compatibility, WHY: TBD
• NO side effects

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note
• NO related changes

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.26 🎉

Comparison is base (71676ee) 37.89% compared to head (d915e50) 38.15%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #751      +/-   ##
============================================
+ Coverage     37.89%   38.15%   +0.26%     
- Complexity     1611     1618       +7     
============================================
  Files           278      278              
  Lines         17511    17517       +6     
  Branches       1991     1992       +1     
============================================
+ Hits           6636     6684      +48     
+ Misses        10208    10160      -48     
- Partials        667      673       +6     

Impacted Files	Coverage Δ
...ain/java/org/tikv/common/region/RegionManager.java	79.32% <66.66%> (-0.44%)	⬇️

... and 8 files with indirect coverage changes

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[pingyu]

LGTM~

[shiyuhang0]

/cherry-pick release-3.3

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-3.3: #752.

[ti-chi-bot]

@shiyuhang0: new pull request could not be created: failed to create pull request against tikv/client-java#release-3.3 from head ti-chi-bot:cherry-pick-751-to-release-3.3: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for ti-chi-bot:cherry-pick-751-to-release-3.3."}],"documentation_url":"https://docs.github.com/rest/reference/pulls#create-a-pull-request"}

In response to this:

/cherry-pick release-3.3

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