add sentinel-go as rate limit component

[UnderTreeTech]

#35

[codecov-io]

Codecov Report

Merging #54 into master will increase coverage by 6.39%.
The diff coverage is 83.05%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   68.42%   74.81%   +6.39%     
==========================================
  Files           3        6       +3     
  Lines          76      135      +59     
==========================================
+ Hits           52      101      +49     
- Misses         21       29       +8     
- Partials        3        5       +2     

Impacted Files	Coverage Δ
pkg/ratelimit/setinel/sentinel.go	33.33% <33.33%> (ø)
pkg/server/http/ratelimit/sentinel/sentinel.go	100.00% <100.00%> (ø)
pkg/server/rpc/ratelimit/sentinel/sentinel.go	100.00% <100.00%> (ø)

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