feat: add plublic events

[leeluolee]

cherry-pick commit from public-api-fix

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[codecov]

Codecov Report

Merging #90 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #90      +/-   ##
=========================================
+ Coverage   91.89%   91.9%   +0.01%     
=========================================
  Files          44      44              
  Lines        1566    1568       +2     
=========================================
+ Hits         1439    1441       +2     
  Misses        127     127

Impacted Files	Coverage Δ
packages/svrx/lib/svrx.js	95.09% <100%> (+0.09%)	⬆️
packages/svrx/index.js	100% <100%> (ø)	⬆️

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