[ type:feature] Support shenyu-sdk-client by openFeign

[damonxue]

Support shenyu-sdk-client by openFeign.

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

❌ Patch coverage is 58.11321% with 111 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.14%. Comparing base (6d341fd) to head (42e03fa).
⚠️ Report is 535 commits behind head on master.

Files with missing lines	Patch %	Lines
...pache/shenyu/sdk/feign/ShenyuClientsRegistrar.java	59.22%	44 Missing and 40 partials ⚠️
...apache/shenyu/sdk/feign/ShenyuDiscoveryClient.java	50.00%	11 Missing and 5 partials ⚠️
...org/apache/shenyu/common/enums/HttpSchemeEnum.java	0.00%	7 Missing ⚠️
...pache/shenyu/sdk/feign/ShenyuClientCapability.java	80.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5041      +/-   ##
============================================
- Coverage     63.17%   63.14%   -0.04%     
- Complexity     8517     8560      +43     
============================================
  Files          1221     1225       +4     
  Lines         36367    36632     +265     
  Branches       3328     3379      +51     
============================================
+ Hits          22974    23130     +156     
- Misses        11503    11565      +62     
- Partials       1890     1937      +47     

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[damonxue]

@yunlongn pls review.

[damonxue]

@yunlongn @moremind pls review.