Set `world` property directly in `manifest.json` to skip extra permission

[flexchar]

Details

This PR disables loading Content Scripts, where world: 'MAIN' is set, using background script. The previous approach causes extra permission in to be added, which negatively impacts Chrome Store reviews and provides arguably a more scary warning popup (permission popup on install) to end users than what is necessary.

This PR passes on the world property directly to the manifest. It is officially supported by the chrome. https://developer.chrome.com/docs/extensions/reference/api/scripting#type-ExecutionWorld

It is however not supported by Firefox but that doesn't alter the current behaviour (it is not supported at all). https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/scripting/ExecutionWorld#browser_compatibility

This is also the answer to my question here https://github.com/PlasmoHQ/plasmo/pull/433#issuecomment-1811057098.

Legacy discussion for the initial implementation: https://github.com/PlasmoHQ/plasmo/issues/422

Code of Conduct

• [X] I agree to follow this project's Code of Conduct
• [X] I agree to license this contribution under the MIT LICENSE
• [X] I checked the current PR for duplication.

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[flexchar]

Replaced by https://github.com/PlasmoHQ/plasmo/pull/1013

I used wrong branch...