[type:refactor]Split the document field of the apidoc detail interface,and add fields such as requestHeaders and responseParameters.

[lianjunwei]

1.To simplify front-end development, the "document" field of the detailed interface of apidoc is disassembled. Added fields such as requestHeaders and responseParameters.

2.#4848 , and fix bug: #4779
Front end pr, see: apache/shenyu-dashboard#294

3.Merge order:
first, #4849 , then ,#4865 (Reason: 4865 is based on a 4849 pull branch.)

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• 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 #4865 (431d6e6) into master (327bf65) will increase coverage by 0.18%.
The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master    #4865      +/-   ##
============================================
+ Coverage     64.29%   64.47%   +0.18%     
- Complexity     8195     8224      +29     
============================================
  Files          1161     1161              
  Lines         34134    34153      +19     
  Branches       3060     3061       +1     
============================================
+ Hits          21946    22020      +74     
+ Misses        10445    10379      -66     
- Partials       1743     1754      +11     

Impacted Files	Coverage Δ
...ache/shenyu/admin/service/impl/ApiServiceImpl.java	27.27% <80.00%> (+3.00%)	⬆️
...n/java/org/apache/shenyu/admin/model/vo/ApiVO.java	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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