optimize IoUtils and Add some unit test

[karsonto]

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Brief changelog

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Verifying this change

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Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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[codecov-commenter]

Codecov Report

Merging #8398 (5dc467d) into develop (58968f9) will increase coverage by 0.01%.
The diff coverage is 40.00%.

@@              Coverage Diff              @@
##             develop    #8398      +/-   ##
=============================================
+ Coverage      41.12%   41.13%   +0.01%     
- Complexity      4376     4378       +2     
=============================================
  Files            873      873              
  Lines          31814    31809       -5     
  Branches        3707     3707              
=============================================
+ Hits           13084    13086       +2     
+ Misses         17420    17415       -5     
+ Partials        1310     1308       -2     

Impacted Files	Coverage Δ
...n/java/com/alibaba/nacos/common/utils/IoUtils.java	9.83% <40.00%> (+0.38%)	⬆️
...a/nacos/core/remote/control/TpsMonitorManager.java	54.54% <0.00%> (-0.65%)	⬇️
...alibaba/nacos/core/remote/control/TpsRecorder.java	75.67% <0.00%> (+1.35%)	⬆️
...os/client/auth/ram/identify/CredentialService.java	82.69% <0.00%> (+3.84%)	⬆️

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[KomachiSion]

Please rebase develop branch, we have fixed the CI and IT problem.