提供SPI机制通过实现WallProviderCreator来自定义扩展WallProvider #5682

[lizongbo]

参考测试用例可以自行实现 com.alibaba.druid.wall.WallProviderCreator，通过spi机制扩展自定义逻辑

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.

Project coverage is 58.63%. Comparing base (098c227) to head (f2d6258).
Report is 361 commits behind head on master.

Files with missing lines	Patch %	Lines
...c/main/java/com/alibaba/druid/wall/WallFilter.java	80.00%	3 Missing and 3 partials ⚠️
...va/com/alibaba/druid/wall/WallProviderCreator.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5772      +/-   ##
============================================
+ Coverage     58.62%   58.63%   +0.01%     
- Complexity    27858    27870      +12     
============================================
  Files          1340     1341       +1     
  Lines        128125   128150      +25     
  Branches      24173    24177       +4     
============================================
+ Hits          75111    75141      +30     
+ Misses        43635    43633       -2     
+ Partials       9379     9376       -3     

Files with missing lines	Coverage Δ
...va/com/alibaba/druid/wall/WallProviderCreator.java	0.00% <0.00%> (ø)
...c/main/java/com/alibaba/druid/wall/WallFilter.java	49.62% <80.00%> (+1.74%)	⬆️

... and 8 files with indirect coverage changes

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