feat: support unwasm condition for core

[antfu]

#71

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[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (311ca69) 97.02% compared to head (5427f26) 96.77%.
Report is 11 commits behind head on main.

❗ Current head 5427f26 differs from pull request most recent head 3dc34f9. Consider uploading reports for the commit 3dc34f9 to get more accurate results

Files	Patch %	Lines
packages/shikiji/src/core-unwasm.ts	0.00%	9 Missing and 1 partial ⚠️
packages/shikiji-core/src/internal.ts	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   97.02%   96.77%   -0.26%     
==========================================
  Files          50       51       +1     
  Lines        4470     4492      +22     
  Branches      567      570       +3     
==========================================
+ Hits         4337     4347      +10     
- Misses        131      142      +11     
- Partials        2        3       +1     

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[pi0]

This needs to be before default as order matters