Add Affinity Router

[wcy666103]

What is the purpose of the change?

Add affinity router rule v3.1 refer here #14455

Brief changelog

dubbo/config/group/{$name}.affinity-router

configVersion: v3.1
scope: service # Or application
key: service.apache.com
enabled: true
runtime: true
affinityAware:
  key: region
  ratio: 20

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.10870% with 101 lines in your changes missing coverage. Please review.

Project coverage is 60.88%. Comparing base (a0b6e47) to head (458d804).

Files with missing lines	Patch %	Lines
...c/cluster/router/affinity/AffinityStateRouter.java	50.00%	28 Missing and 6 partials ⚠️
...affinity/config/AffinityListenableStateRouter.java	47.16%	19 Missing and 9 partials ⚠️
...ffinity/config/AffinityProviderAppStateRouter.java	0.00%	27 Missing ⚠️
...uter/affinity/config/model/AffinityRouterRule.java	84.21%	2 Missing and 1 partial ⚠️
...uter/affinity/config/model/AffinityRuleParser.java	66.66%	2 Missing and 1 partial ⚠️
...er/router/affinity/AffinityStateRouterFactory.java	0.00%	2 Missing ⚠️
.../config/AffinityProviderAppStateRouterFactory.java	0.00%	2 Missing ⚠️
...nity/config/AffinityServiceStateRouterFactory.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #14787      +/-   ##
============================================
- Coverage     60.91%   60.88%   -0.04%     
- Complexity       12    11460   +11448     
============================================
  Files          1898     1907       +9     
  Lines         86477    86661     +184     
  Branches      12965    12988      +23     
============================================
+ Hits          52678    52762      +84     
- Misses        28358    28444      +86     
- Partials       5441     5455      +14     

Flag	Coverage Δ
integration-tests-java17	32.95% <0.00%> (-0.09%)	⬇️
integration-tests-java8	33.06% <0.00%> (-0.07%)	⬇️
samples-tests-java17	31.39% <0.00%> (-0.06%)	⬇️
samples-tests-java8	29.28% <0.00%> (+0.03%)	⬆️
unit-tests	58.80% <45.10%> (-0.03%)	⬇️

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