[Enhance] add some unit tests and some integration tests for address module

[onewe]

• add spring-boot-starter-test dependency
• use constructor injection instead of field injection

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[codecov-commenter]

Codecov Report

Merging #8643 (e46e729) into develop (7aa74b9) will increase coverage by 0.36%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #8643      +/-   ##
=============================================
+ Coverage      41.57%   41.93%   +0.36%     
- Complexity      4458     4512      +54     
=============================================
  Files            882      884       +2     
  Lines          32127    32252     +125     
  Branches        3721     3733      +12     
=============================================
+ Hits           13357    13526     +169     
+ Misses         17416    17370      -46     
- Partials        1354     1356       +2     

Impacted Files	Coverage Δ
...ess/controller/AddressServerClusterController.java	100.00% <100.00%> (+100.00%)	⬆️
...nacos/address/controller/ServerListController.java	100.00% <100.00%> (+100.00%)	⬆️
...ba/nacos/naming/core/v2/client/AbstractClient.java	43.54% <0.00%> (-19.25%)	⬇️
...nacos/common/remote/client/grpc/GrpcSdkClient.java	50.00% <0.00%> (-16.67%)	⬇️
...s/common/remote/client/grpc/GrpcClusterClient.java	50.00% <0.00%> (-16.67%)	⬇️
...aba/nacos/naming/core/v2/index/ServiceStorage.java	51.66% <0.00%> (-15.73%)	⬇️
...os/client/auth/ram/identify/CredentialService.java	78.84% <0.00%> (-3.85%)	⬇️
...ephemeral/distro/v2/DistroClientDataProcessor.java	9.28% <0.00%> (-1.83%)	⬇️
...m/alibaba/nacos/core/remote/ConnectionManager.java	44.37% <0.00%> (-1.48%)	⬇️
.../alibaba/nacos/core/remote/grpc/GrpcSdkServer.java	100.00% <0.00%> (ø)
... and 19 more

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[pixystone]

LGTM