feat: ESM content script support

[aklinker1]

This PR likely won't be merged, this is a complex change and I just want to see what it will look like to get dev mode working.

Add type: "module" to your content script options:

export default defineContentScript({
  type: "module",
  // ...
});

This closes #357.

Todo

• Build mode works
• Try out dev mode... Not sure what will be required there yet

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[aklinker1]

Revert

[codecov]

Codecov Report

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

Comparison is base (66bd957) 80.59% compared to head (36e689d) 80.57%.
Report is 11 commits behind head on main.

❗ Current head 36e689d differs from pull request most recent head f39cfdc. Consider uploading reports for the commit f39cfdc to get more accurate results

Files	Patch %	Lines
src/core/utils/building/internal-build.ts	14.28%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #406      +/-   ##
==========================================
- Coverage   80.59%   80.57%   -0.03%     
==========================================
  Files         108      109       +1     
  Lines        7782     7875      +93     
  Branches      706      716      +10     
==========================================
+ Hits         6272     6345      +73     
- Misses       1494     1514      +20     
  Partials       16       16              

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[aklinker1]

Closing in favor of #584