Add support for WebDriver BiDi language emulation

[lutien]

The PR to add the required hook in WebDriver BiDi spec: w3c/webdriver-bidi#1017.

• At least two implementers are interested (and none opposed):
  • Chromium
  • Mozilla
• Tests are written and can be reviewed and commented upon at:
  • Add checks for "navigator.language/s" to tests for "emulation.setLocaleOverride" command. web-platform-tests/wpt#55453
• Implementation bugs are filed:
  • Chromium: Respect emulation.setLocaleOverride in navigator.language GoogleChromeLabs/chromium-bidi#3863
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1994396
  • WebKit: N/A
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): N/A
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): N/A
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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[annevk]

This is a good start, but now that you're making these algorithms more complex, you should turn them into a list of steps similar to most other algorithms. Then they will become easier to read.

[lutien]

The WebDriver BiDi part is merged. So this should be ready for review.