Task[#4379] Plugin upload hot load into Shenyu

[ywj1352]

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 #4392 (077d234) into master (74c5022) will decrease coverage by 0.09%.
The diff coverage is 24.65%.

@@             Coverage Diff              @@
##             master    #4392      +/-   ##
============================================
- Coverage     68.11%   68.02%   -0.09%     
- Complexity     7549     7552       +3     
============================================
  Files          1027     1027              
  Lines         29266    29316      +50     
  Branches       2635     2641       +6     
============================================
+ Hits          19934    19943       +9     
- Misses         7755     7795      +40     
- Partials       1577     1578       +1     

Impacted Files	Coverage Δ
...g/apache/shenyu/web/loader/ShenyuPluginLoader.java	59.66% <7.69%> (-15.16%)	⬇️
...rg/apache/shenyu/web/handler/ShenyuWebHandler.java	91.30% <40.00%> (-4.09%)	⬇️
.../apache/shenyu/web/loader/ShenyuLoaderService.java	72.41% <73.33%> (-18.07%)	⬇️
...pringboot/starter/gateway/ShenyuConfiguration.java	91.30% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[ywj1352]

it works in local