[ISSUE #4848]Storage adjustment for swagger type API documents: change from local cache to database.

[lianjunwei]

1. issue see: [Task] <apidoc enhance and optimize. > #4848 task1. and fix [BUG] api document does't work #4779
2. Merge order:
   first, [ISSUE #4848]Storage adjustment for swagger type API documents: change from local cache to database. #4849 , then ,[type:optimize][ ISSUE #4848] If there are no changes to the apidoc content, there is no need to update the database. #4860

[codecov-commenter]

Codecov Report

Merging #4849 (cd76eb6) into master (a62a04c) will decrease coverage by 0.27%.
The diff coverage is 51.45%.

@@             Coverage Diff              @@
##             master    #4849      +/-   ##
============================================
- Coverage     64.53%   64.27%   -0.27%     
+ Complexity     8212     8198      -14     
============================================
  Files          1160     1161       +1     
  Lines         34086    34134      +48     
  Branches       3055     3056       +1     
============================================
- Hits          21998    21938      -60     
- Misses        10346    10450     +104     
- Partials       1742     1746       +4     

Impacted Files	Coverage Δ
...ache/shenyu/admin/controller/ApiDocController.java	76.08% <ø> (+1.61%)	⬆️
...ervice/manager/impl/RegisterApiDocServiceImpl.java	4.65% <4.65%> (ø)
.../service/manager/impl/LoadServiceDocEntryImpl.java	69.00% <66.66%> (ø)
...ervice/manager/impl/PullSwaggerDocServiceImpl.java	23.07% <66.66%> (ø)
...nyu/admin/service/manager/impl/DocManagerImpl.java	79.22% <84.44%> (+4.22%)	⬆️
...va/org/apache/shenyu/admin/model/bean/DocInfo.java	100.00% <100.00%> (ø)
...va/org/apache/shenyu/admin/model/bean/DocItem.java	81.63% <100.00%> (-12.25%)	⬇️
...u/admin/service/manager/impl/SwaggerDocParser.java	41.41% <100.00%> (-2.25%)	⬇️
...ister/AbstractShenyuClientRegisterServiceImpl.java	93.84% <100.00%> (-0.39%)	⬇️

... and 18 files with indirect coverage changes

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