feat: introduce twoslash-protocol package

[antfu]

resolve #17

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[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (58daca8) 94.69% compared to head (1bffa32) 94.52%.

Files	Patch %	Lines
packages/twoslash/src/core.ts	80.95%	4 Missing ⚠️
packages/twoslash/src/legacy.ts	85.71%	2 Missing ⚠️
packages/twoslash-protocol/src/utils.ts	99.28%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   94.69%   94.52%   -0.17%     
==========================================
  Files          10       13       +3     
  Lines        1620     1663      +43     
  Branches      305      318      +13     
==========================================
+ Hits         1534     1572      +38     
- Misses         86       91       +5     

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