feat: use unplugin for loader

[antfu]

Use unplugin to support both Webpack and Vite, Using the logic from unplugin-vue-components to directly replace the component usage instead of local installation (make the codebase simpler and the runtime faster)

[codecov]

Codecov Report

Merging #235 (98244f1) into main (f8667b6) will decrease coverage by 14.09%.
The diff coverage is 13.33%.

❗ Current head 98244f1 differs from pull request most recent head 539eb7d. Consider uploading reports for the commit 539eb7d to get more accurate results

@@             Coverage Diff             @@
##             main     #235       +/-   ##
===========================================
- Coverage   86.28%   72.18%   -14.10%     
===========================================
  Files           7        6        -1     
  Lines         175      169        -6     
  Branches       47       48        +1     
===========================================
- Hits          151      122       -29     
- Misses         24       47       +23     

Impacted Files	Coverage Δ
src/scan.ts	98.18% <ø> (ø)
src/loader.ts	6.25% <6.25%> (-93.75%)	⬇️
src/index.ts	80.00% <25.00%> (+4.63%)	⬆️
test/unit/utils.ts	100.00% <100.00%> (ø)

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