[to #556] slowlog: attach cluster_id and pd_addresses to slow log properties

[iosmanthus]

Signed-off-by: iosmanthus myosmanthustree@gmail.com

What problem does this PR solve?

Issue Number: to #556

Problem Description:
Attach cluster_id and pd_addresses to slow log to distinguish the request destination while handling multiple TiKV clusters.

What is changed and how does it work?

Add withFields for SlowLogImpl, and use this interface to attach info dynamically while constructing the slow logger.

Code changes

• Has exported function/method change

Check List for Tests

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

• Unit test

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note

[marsishandsome]

LGTM

[zz-jason]

LGTM

[codecov]

Codecov Report

Merging #557 (284814c) into master (9798382) will decrease coverage by 0.18%.
The diff coverage is 94.73%.

@@             Coverage Diff              @@
##             master     #557      +/-   ##
============================================
- Coverage     32.23%   32.05%   -0.19%     
  Complexity     1332     1332              
============================================
  Files           278      279       +1     
  Lines         17345    17372      +27     
  Branches       1975     1980       +5     
============================================
- Hits           5591     5568      -23     
- Misses        11145    11194      +49     
- Partials        609      610       +1     

Impacted Files	Coverage Δ
...ain/java/org/tikv/common/log/SlowLogEmptyImpl.java	57.14% <0.00%> (-9.53%)	⬇️
src/main/java/org/tikv/raw/RawKVClient.java	61.83% <92.85%> (+0.18%)	⬆️
src/main/java/org/tikv/common/PDClient.java	59.75% <100.00%> (+0.19%)	⬆️
src/main/java/org/tikv/common/log/SlowLog.java	100.00% <100.00%> (ø)
src/main/java/org/tikv/common/log/SlowLogImpl.java	98.50% <100.00%> (+0.63%)	⬆️
...rc/main/java/io/grpc/netty/NettyClientHandler.java	55.81% <0.00%> (-7.55%)	⬇️
...ty/handler/codec/http2/Http2ConnectionHandler.java	49.87% <0.00%> (-3.18%)	⬇️
...va/org/tikv/common/region/StoreHealthyChecker.java	63.15% <0.00%> (-1.32%)	⬇️

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[ti-srebot]

cherry pick to release-3.1 in PR #559

[ti-srebot]

cherry pick to release-3.2 in PR #560