Article about module support in web extensions

### What would you like to see added to BCD?

### Preamble

The identical proposal applies to both [import](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import) & [import()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import). If required, I can split them into 2 topics.

### Details

The following relevant data would be beneficial to have in BCD (as finding the data requires going through many pages).

- Available in workers (already listed in both) :heavy_check_mark:
- Available in background service worker (MV3)
- Available in background event page (MV3)
- Available in background scripts (MV2)
Available by loading background script as module via a background page
- Available in content script

Also relevant to:

- [background](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/background)
- [content_scripts](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts)

### Reference

[Support type: "module" (background service worker as a ES module)](https://bugzilla.mozilla.org/show_bug.cgi?id=1775574)
[Support type: "module" (event page, not background service worker)](https://bugzilla.mozilla.org/show_bug.cgi?id=1811443)
[Support loading content scripts as ES6 modules](https://bugzilla.mozilla.org/show_bug.cgi?id=1451545)
[Dynamic module import doesn't work in webextension content scripts](https://bugzilla.mozilla.org/show_bug.cgi?id=1536094)
[Dynamic import fails in content script in MV3 extension](https://bugzilla.mozilla.org/show_bug.cgi?id=1803950)

### How impactful do you think this enhancement will be?

Provide additional data as per aforementioned

### Do you have anything more you want to share?

_No response_