[example]add swagger to the example project to test the apidoc function of the gateway management system.

[lianjunwei]

Only the following two projects are added with swagger： 1.shenyu-examples-http Conditions for generating interface documents: only the classes annotated with "ApiOperation" can generate interface documents

2.shenyu-examples-springcloud Conditions for generating interface documents: Generated without "ApiOperation" annotation.

[codecov-commenter]

Codecov Report

Merging #3846 (40a0bd4) into master (1cd6444) will decrease coverage by 0.02%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3846      +/-   ##
============================================
- Coverage     64.54%   64.53%   -0.02%     
- Complexity     8171     8177       +6     
============================================
  Files          1147     1147              
  Lines         33795    33795              
  Branches       3014     3014              
============================================
- Hits          21813    21809       -4     
- Misses        10260    10265       +5     
+ Partials       1722     1721       -1     

see 3 files with indirect coverage changes

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