add sentinel plugin

[tydhot]

No description provided.

[codecov-io]

Codecov Report

Merging #331 (cf3f53c) into master (1b72277) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #331   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          21      22    +1     
  Lines          47      49    +2     
  Branches        1       1           
======================================
- Misses         47      49    +2     

Impacted Files	Coverage Δ
...r/plugin/sentinel/SentinelPluginConfiguration.java	0.00% <0.00%> (ø)

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[dengliming]

UI代码还没提交吧？