Feature flush

[frankzhaopeng]

1. JS SDK supports cusom event, pageview event and click event reporting.
2. JS SDK supports manually pushing events method flush

[codecov-commenter]

Codecov Report

Merging #8 (e223992) into main (5f9c148) will decrease coverage by 5.30%.
The diff coverage is 80.99%.

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@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   90.94%   85.65%   -5.30%     
==========================================
  Files           5        7       +2     
  Lines         265      467     +202     
  Branches       43       99      +56     
==========================================
+ Hits          241      400     +159     
- Misses         23       65      +42     
- Partials        1        2       +1     

Impacted Files	Coverage Δ
src/FeatureProbe.ts	89.85% <72.22%> (-3.27%)	⬇️
src/EventRecorder.ts	80.80% <80.80%> (ø)
src/autoReportEvents.ts	84.33% <84.33%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/platform.ts	70.27% <0.00%> (-8.11%)	⬇️