fix: Fix event type bug and allow custom read to skip events

[bill-min]

Description

• Fix a bug in parseEvent function that the event type should be in event field, there is no type field in SSE.
• Add a feature that allow custom read to return undefined where the event should be skipped.

Motivation and Context

Screenshots (if appropriate):

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.05% 🎉

Comparison is base (e9eba7d) 95.65% compared to head (7ae177b) 95.70%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   95.65%   95.70%   +0.05%     
==========================================
  Files           6        6              
  Lines         161      163       +2     
  Branches       26       27       +1     
==========================================
+ Hits          154      156       +2     
  Misses          2        2              
  Partials        5        5              

Files Changed	Coverage Δ
src/util/stream.ts	91.89% <50.00%> (-1.17%)	⬇️
src/components/micro-frame-sse/parser.ts	97.14% <100.00%> (+2.85%)	⬆️

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[github-actions]

🎉 This PR is included in version 1.6.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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