[type:refactor]Removed unused generics

[tian-pengfei]

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.

Removed unused generics from ApiBean

[codecov-commenter]

Codecov Report

Merging #4653 (306f10b) into master (307a38f) will decrease coverage by 0.01%.
The diff coverage is 38.46%.

@@             Coverage Diff              @@
##             master    #4653      +/-   ##
============================================
- Coverage     67.34%   67.34%   -0.01%     
- Complexity     8001     8002       +1     
============================================
  Files          1097     1097              
  Lines         31574    31574              
  Branches       2861     2861              
============================================
- Hits          21264    21262       -2     
- Misses         8636     8639       +3     
+ Partials       1674     1673       -1     

Impacted Files	Coverage Δ
...rg/apache/shenyu/client/core/register/ApiBean.java	0.00% <0.00%> (ø)
...core/register/ClientApiRefreshedEventListener.java	0.00% <0.00%> (ø)
...core/register/matcher/AnnotatedApiBeanMatcher.java	0.00% <ø> (ø)
...egister/matcher/AnnotatedApiDefinitionMatcher.java	0.00% <ø> (ø)
...u/client/core/register/matcher/ApiBeanMatcher.java	0.00% <0.00%> (ø)
...nt/core/register/matcher/ApiDefinitionMatcher.java	0.00% <0.00%> (ø)
...lient/core/register/matcher/ApiDocBeanMatcher.java	0.00% <0.00%> (ø)
...core/register/matcher/ApiDocDefinitionMatcher.java	0.00% <0.00%> (ø)
...egister/parser/AbstractApiDocDefinitionParser.java	0.00% <ø> (ø)
...re/register/parser/HttpApiDocDefinitionParser.java	0.00% <ø> (ø)
... and 11 more

... and 2 files with indirect coverage changes

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