feat!: auto extract exports

[antfu]

resolve #103

Todo:

• Support PackagePreset
• Global Cache
• Package.json's meta.unimport field support

Breaking changes:

• Internal context type change
• generateTypeDeclarations, getExports become async

[codecov]

Codecov Report

Merging #104 (af51820) into main (b9e2050) will decrease coverage by 0.02%.
The diff coverage is 98.52%.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   98.38%   98.36%   -0.03%     
==========================================
  Files          21       23       +2     
  Lines        1677     1839     +162     
  Branches      248      270      +22     
==========================================
+ Hits         1650     1809     +159     
- Misses         27       30       +3     

Impacted Files	Coverage Δ
src/extract.ts	95.89% <95.89%> (ø)
src/addons/vue-template.ts	95.45% <100.00%> (+0.06%)	⬆️
src/context.ts	93.11% <100.00%> (+0.16%)	⬆️
src/preset.ts	95.83% <100.00%> (+0.96%)	⬆️
src/types.ts	100.00% <100.00%> (ø)
src/utils.ts	97.56% <100.00%> (ø)
test/auto-extract.test.ts	100.00% <100.00%> (ø)
test/dts.test.ts	100.00% <100.00%> (ø)
test/preset.test.ts	100.00% <100.00%> (ø)
test/vue-template.test.ts	100.00% <100.00%> (ø)

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[antfu]

I guess we could have it for now, and leave meta.unimport for another PR with a more detailed design?