optimize: caching the ConsistentHashSelector to avoid remapping when select every time.

[hein-hp]

Caching the ConsistentHashSelector to avoid remapping when select every time.

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Caching the ConsistentHashSelector to avoid remapping when select every time.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[slievrly]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 51.57%. Comparing base (117e57a) to head (507573f).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...scovery/loadbalance/ConsistentHashLoadBalance.java	83.33%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x    #7072   +/-   ##
=========================================
  Coverage     51.56%   51.57%           
- Complexity     6812     6813    +1     
=========================================
  Files          1169     1169           
  Lines         41482    41505   +23     
  Branches       4851     4857    +6     
=========================================
+ Hits          21389    21405   +16     
- Misses        18072    18075    +3     
- Partials       2021     2025    +4     

Files with missing lines	Coverage Δ
...scovery/loadbalance/ConsistentHashLoadBalance.java	84.31% <83.33%> (-1.41%)	⬇️

... and 4 files with indirect coverage changes

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