[type:feature] ShenYu Admin Cluster

[Aias00]

See #5448

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.85185% with 130 lines in your changes are missing coverage. Please review.

Project coverage is 61.41%. Comparing base (b0bbbb8) to head (757620e). Report is 5 commits behind head on master.

Files	Patch %	Lines
...ache/shenyu/admin/filter/ClusterForwardFilter.java	4.83%	59 Missing :warning:
...u/admin/service/impl/ClusterMasterServiceImpl.java	48.14%	27 Missing and 1 partial :warning:
...pache/shenyu/admin/model/dto/ClusterMasterDTO.java	53.33%	14 Missing :warning:
...admin/service/impl/ClusterSelectMasterService.java	63.88%	12 Missing and 1 partial :warning:
...che/shenyu/admin/model/entity/ClusterMasterDO.java	85.71%	7 Missing :warning:
...nyu/admin/config/properties/ClusterProperties.java	25.00%	3 Missing :warning:
...nyu/admin/listener/DataChangedEventDispatcher.java	25.00%	2 Missing and 1 partial :warning:
...henyu/admin/service/impl/UpstreamCheckService.java	80.00%	0 Missing and 3 partials :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5544      +/-   ##
============================================
- Coverage     61.48%   61.41%   -0.08%     
- Complexity     8805     8858      +53     
============================================
  Files          1261     1268       +7     
  Lines         39225    39527     +302     
  Branches       3719     3745      +26     
============================================
+ Hits          24118    24275     +157     
- Misses        12927    13076     +149     
+ Partials       2180     2176       -4     

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[Aias00]

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