feat:support polaris server nearby backup LB.

[SkyeBeFreeman]

PR Type

Describe what this PR does for and how you did.

Adding the issue link (#xxx) if possible.

Note

Checklist

• Add information of this PR to CHANGELOG.md in root of project.
• Add documentation in javadoc or comment below the PR if necessary.

[shedfreewu]

ok

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 67.09%. Comparing base (c9e3219) to head (693e8d7).
Report is 1 commits behind head on 2022.

Files with missing lines	Patch %	Lines
...laris/context/config/PolarisContextProperties.java	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               2022    #1627   +/-   ##
=========================================
  Coverage     67.09%   67.09%           
  Complexity       20       20           
=========================================
  Files           340      340           
  Lines          8312     8325   +13     
  Branches       1027     1027           
=========================================
+ Hits           5577     5586    +9     
- Misses         2248     2252    +4     
  Partials        487      487           

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