[ISSUE #4235]supports generation of mock data on request

[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.

implement #4235

Function Display

• config
  

responseContent:

{
  "name": ${expression|#req.json.name},
   "country":${expression|#req.json.address.country},
   "header_name":${expression|#req.headers[header_name]},
    "method":${expression|#req.method},
    "json_id":${expression|#req.json.id},
    "query_id":${expression|#req.queries[id]},
   "uri":${expression|#req.uri}

}

• send request
  

[yu199195]

Do you need to initialize each time?

[tian-pengfei]

Generation mock data on request in multithreading is not safe, this commit slove this preoblem .but it isnt a good method .

[yu199195]

here，no thread safety .

[tian-pengfei]

you mean ,thread safety is not required here?

[yu199195]

yes~

[codecov-commenter]

Codecov Report

Merging #4236 (12eccf5) into master (14bc2bd) will decrease coverage by 0.00%.
The diff coverage is 60.78%.

@@             Coverage Diff              @@
##             master    #4236      +/-   ##
============================================
- Coverage     69.58%   69.58%   -0.01%     
- Complexity     7362     7369       +7     
============================================
  Files           992      993       +1     
  Lines         27885    27926      +41     
  Branches       2473     2473              
============================================
+ Hits          19403    19431      +28     
- Misses         7003     7017      +14     
+ Partials       1479     1478       -1     

Impacted Files	Coverage Δ
...java/org/apache/shenyu/plugin/mock/MockPlugin.java	0.00% <0.00%> (ø)
...he/shenyu/plugin/mock/generator/BoolGenerator.java	80.00% <ø> (ø)
...yu/plugin/mock/generator/CurrentTimeGenerator.java	77.77% <ø> (ø)
...e/shenyu/plugin/mock/generator/EmailGenerator.java	66.66% <ø> (ø)
...henyu/plugin/mock/generator/EnStringGenerator.java	77.77% <ø> (ø)
...e/shenyu/plugin/mock/generator/PhoneGenerator.java	83.33% <ø> (ø)
...u/plugin/mock/generator/RandomDoubleGenerator.java	75.00% <ø> (ø)
...enyu/plugin/mock/generator/RandomIntGenerator.java	87.50% <ø> (ø)
...enyu/plugin/mock/generator/RangeDataGenerator.java	85.71% <ø> (ø)
...henyu/plugin/mock/generator/ZhStringGenerator.java	77.77% <ø> (ø)
... and 6 more

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