fix: expose CustomEvent constructor

[sgammon]

Summary

Fixes missing CustomEvent constructor; exposed by tests added in #1212.

[codecov]

Codecov Report

Attention: Patch coverage is 93.39623% with 7 lines in your changes missing coverage. Please review.

Project coverage is 53.16%. Comparing base (9bd1849) to head (c07ecc7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/gvm/internals/intrinsics/js/abort/AbortSignal.kt	90.76%	2 Missing and 4 partials ⚠️
...e/runtime/intrinsics/js/node/events/CustomEvent.kt	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1213      +/-   ##
==========================================
+ Coverage   52.89%   53.16%   +0.27%     
==========================================
  Files         425      429       +4     
  Lines       17142    17242     +100     
  Branches     3101     3125      +24     
==========================================
+ Hits         9067     9167     +100     
+ Misses       7062     7055       -7     
- Partials     1013     1020       +7     

Flag	Coverage Δ
jvm	53.16% <93.39%> (+0.27%)	⬆️
lib	53.16% <93.39%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...gvm/internals/intrinsics/js/AbstractJsIntrinsic.kt	80.00% <100.00%> (-20.00%)	⬇️
...m/internals/intrinsics/js/abort/AbortController.kt	100.00% <100.00%> (ø)
...m/internals/intrinsics/js/abort/AbortIntrinsics.kt	100.00% <100.00%> (ø)
.../kotlin/elide/runtime/gvm/internals/js/JsTimers.kt	60.99% <100.00%> (ø)
...vm/src/main/kotlin/elide/runtime/gvm/js/JsError.kt	32.60% <100.00%> (+2.17%)	⬆️
.../kotlin/elide/runtime/intrinsics/GuestIntrinsic.kt	28.57% <ø> (ø)
...lin/elide/runtime/intrinsics/js/AbortController.kt	100.00% <100.00%> (ø)
...tlin/elide/runtime/intrinsics/js/ReadableStream.kt	0.00% <ø> (ø)
...tlin/elide/runtime/intrinsics/js/node/EventsAPI.kt	100.00% <ø> (ø)
.../runtime/intrinsics/js/node/events/EventOptions.kt	29.03% <ø> (ø)
... and 7 more

... and 5 files with indirect coverage changes

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