fix(bun): export BunWebSocketData and BunWebSocketHandler

[yusukebe]

Fixes #3998

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[github-actions]

Bundle size check

	main (d629c62)	#4002 (cf8dbe2)	+/-
Bundle Size (B)	18,976B	18,976B	0B
Bundle Size (KB)	18.53K	18.53K	0K

Compiler Diagnostics

	main (d629c62)	#4002 (cf8dbe2)	+/-
Files	261	261	0
Lines	116,441	116,441	0
Identifiers	114,438	114,438	0
Symbols	303,842	303,842	0
Types	214,832	214,832	0
Instantiations	3,091,594	3,091,594	0
Memory used	451,109K	445,643K	-5,466K
I/O read	0.03s	0.02s	-0.01s
I/O write	0s	0s	0s
Parse time	0.73s	0.66s	-0.07s
Bind time	0.35s	0.27s	-0.08s
Check time	5.98s	5.36s	-0.62s
Emit time	0s	0s	0s
Total time	7.06s	6.29s	-0.77s

---

Reported by octocov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (eb86162) to head (aaf7794).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4002      +/-   ##
==========================================
+ Coverage   91.29%   91.32%   +0.03%     
==========================================
  Files         168      168              
  Lines       10771    10687      -84     
  Branches     3054     3174     +120     
==========================================
- Hits         9833     9760      -73     
+ Misses        937      926      -11     
  Partials        1        1              

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