Optimized for ShenyuWebHandler#putExtPlugins method

[aoshiguchen]

…ugins method.

Make sure that:

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

[codecov-commenter]

Codecov Report

Merging #4598 (f2dacaa) into master (56c2a05) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##             master    #4598   +/-   ##
=========================================
  Coverage     69.33%   69.34%           
- Complexity     7824     7825    +1     
=========================================
  Files          1037     1037           
  Lines         29816    29816           
  Branches       2724     2725    +1     
=========================================
+ Hits          20673    20675    +2     
+ Misses         7518     7515    -3     
- Partials       1625     1626    +1     

Impacted Files	Coverage Δ
...rg/apache/shenyu/web/handler/ShenyuWebHandler.java	90.12% <50.00%> (-2.47%)	⬇️

... and 1 file with indirect coverage changes

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