[ISSUE #4687] shenyu-sdk-spring test case.

[damonxue]

#4538

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 #4913 (4ac138d) into master (3ab7df0) will increase coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 80.95%.

@@             Coverage Diff              @@
##             master    #4913      +/-   ##
============================================
+ Coverage     64.04%   64.06%   +0.01%     
- Complexity     8312     8439     +127     
============================================
  Files          1180     1195      +15     
  Lines         34867    35368     +501     
  Branches       3115     3203      +88     
============================================
+ Hits          22331    22658     +327     
- Misses        10763    10868     +105     
- Partials       1773     1842      +69     

Files Changed	Coverage Δ
...ng/annotation/RequestHeaderParameterProcessor.java	73.07% <42.85%> (ø)
...ing/annotation/RequestParamParameterProcessor.java	86.36% <80.00%> (ø)
...ing/annotation/PathVariableParameterProcessor.java	88.00% <88.88%> (ø)
...ache/shenyu/sdk/spring/ShenyuClientsRegistrar.java	66.04% <100.00%> (ø)
...ring/annotation/CookieValueParameterProcessor.java	94.11% <100.00%> (ø)

... and 15 files with indirect coverage changes

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[damonxue]

pls review. @moremind