feat(vercel): add getConnInfo for vercel adapter

[promer94]

This pr adds getConnInfo for vercel adapter based on https://github.com/vercel/vercel/blob/b70bfb5fbf28a4650d4042ce68ca5c636d37cf44/packages/edge/src/edge-headers.ts#L10-L12C32

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 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.87%. Comparing base (75c314c) to head (d44be38).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/adapter/vercel/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3085      +/-   ##
==========================================
- Coverage   95.88%   95.87%   -0.01%     
==========================================
  Files         137      138       +1     
  Lines       13475    13485      +10     
  Branches     2384     2359      -25     
==========================================
+ Hits        12920    12929       +9     
- Misses        555      556       +1     

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[yusukebe]

LGTM!

[yusukebe]

Hi @promer94 !

Sorry for my late reply. Looks good! I'll merge this into the next branch and release the next minor version, 4.5.0, which includes this feature soon! Thanks!