feat: Generate ESLint globals file for auto-imports

[aklinker1]

This closes #448. A new file, .wxt/eslintrc-auto-import.json is generated when the .wxt/ directory is generated (prepare, dev, build, zip, etc).

If you have ESLint installed already, the JSON file will be generated automatically. You just need to extend it in your ESLint config:

// .eslintrc.js
module.exports = {
  extends: [
    './.wxt/eslintrc-auto-import.json',
  ],
}

If the file isn't being generated (eslint isn't a direct dependency, or you're in a monorepo and it's not a dependency of the package at all), you can enable this file manually:

// wxt.config.ts
export default defineConfig({
  imports: {
    eslintrc: {
      enabled: true
    },
  },
})

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f02aae2) 85.56% compared to head (c3c79de) 85.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
+ Coverage   85.56%   85.65%   +0.08%     
==========================================
  Files         107      106       -1     
  Lines        7940     8031      +91     
  Branches      767      779      +12     
==========================================
+ Hits         6794     6879      +85     
- Misses       1133     1139       +6     
  Partials       13       13              

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