[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 (dee2616) into master (fe8f232) will decrease coverage by 0.00%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3846      +/-   ##
============================================
- Coverage     64.76%   64.76%   -0.01%     
+ Complexity     6097     6096       -1     
============================================
  Files           898      898              
  Lines         24722    24722              
  Branches       2240     2240              
============================================
- Hits          16011    16010       -1     
- Misses         7304     7305       +1     
  Partials       1407     1407              

Impacted Files	Coverage Δ
...henyu/admin/service/impl/UpstreamCheckService.java	62.66% <0.00%> (-1.34%)	:arrow_down:
...henyu/plugin/grpc/resolver/ShenyuNameResolver.java	63.82% <0.00%> (+1.06%)	:arrow_up:

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