feat(codegen): new pacakge

[antfu]

New codegen pacakge to compose bundles easier

[netlify]

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[netlify]

✅ Deploy Preview for shiki-matsu ready!

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[codecov]

Codecov Report

Attention: Patch coverage is 74.73684% with 48 lines in your changes missing coverage. Please review.

Project coverage is 94.64%. Comparing base (fa54de0) to head (8b4d949).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/codegen/src/cli.ts	0.00%	44 Missing and 1 partial ⚠️
packages/codegen/src/index.ts	97.93%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #889      +/-   ##
==========================================
- Coverage   95.18%   94.64%   -0.54%     
==========================================
  Files          86       88       +2     
  Lines        7096     7286     +190     
  Branches     1467     1497      +30     
==========================================
+ Hits         6754     6896     +142     
- Misses        334      381      +47     
- Partials        8        9       +1     

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