feat!: Add support for "main world" content scripts

[aklinker1]

This closes #282.

Now, when a content script is built, it will use different virtual entrypoints depending on the world option. If it's undefined or "ISOLATED", it will continue working as-is. If it's "MAIN", then a separate entrypoint is imported that doesn't load the webextension-polyfill, since main world content scripts run in a sandboxed environment without access to the extension APIs.

BREAKING CHANGE: In order to isolate the webextension-polyfill from being imported automatically from wxt/client when importing defineContentScript, defineContentScript and defineBackgroundScript have been moved from wxt/client to wxt/sandbox.

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[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (0873c24) 70.20% compared to head (f4e54f4) 69.98%.

Files	Patch %	Lines
...rc/virtual/content-script-main-world-entrypoint.ts	0.00%	13 Missing and 1 partial ⚠️
demo/src/entrypoints/main-world.content.ts	0.00%	7 Missing and 1 partial ⚠️
scripts/build.ts	0.00%	6 Missing ⚠️
src/types/internal.ts	0.00%	6 Missing ⚠️
src/sandbox/index.ts	0.00%	4 Missing ⚠️
src/client/index.ts	0.00%	2 Missing ⚠️
src/core/builders/vite/index.ts	94.44%	1 Missing ⚠️
...irtual/content-script-isolated-world-entrypoint.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
- Coverage   70.20%   69.98%   -0.23%     
==========================================
  Files         133      135       +2     
  Lines        7395     7459      +64     
  Branches      575      580       +5     
==========================================
+ Hits         5192     5220      +28     
- Misses       2153     2187      +34     
- Partials       50       52       +2     

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[mefengl]

@aklinker1

It seems this line might not reflect the recent breaking changes. Should it be updated to wxt/sandbox?

wxt/src/core/builders/vite/plugins/noopBackground.ts

Line 19 in 5f241cf

return `import { defineBackground } from 'wxt/client';\nexport default defineBackground(() => void 0)`;

[aklinker1]

@mefengl good catch! I'll fix it today

[aklinker1]

@mefengl Fixed in #298, released in v0.12.5