feat(ws): Make WebSocket adapter more changeable

[nakasyou]

Closes #3468. And also related to #3005 and #3466.

In the PR, I added defineWebSocketHelper function and WSContext class.
We can change WebSocket helper interface easier than before merge this.

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

[codecov]

Codecov Report

Attention: Patch coverage is 95.37037% with 5 lines in your changes missing coverage. Please review.

Project coverage is 94.74%. Comparing base (f8664b0) to head (a7717df).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/adapter/cloudflare-workers/websocket.ts	87.80%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3531      +/-   ##
==========================================
+ Coverage   94.30%   94.74%   +0.44%     
==========================================
  Files         157      157              
  Lines        9488     9522      +34     
  Branches     2773     2801      +28     
==========================================
+ Hits         8948     9022      +74     
+ Misses        540      500      -40     

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[nakasyou]

Hi @yusukebe, what do you think about this? I think it helps #3466.

[yusukebe]

LGTM!

[yusukebe]

Hi @nakasyou

Awesome! This is a good feature and refactors things, and the code is clean. I'll merge this now and include it into a patch release since this change does not introduce a new feature for the WebSocket feature for Bun/Deno/Workers adapters, which is facing the users. Thank you so much!