[testdriver] Add testdriver extension for prefetch event in speculation module

[srwei]

Spec: https://wicg.github.io/nav-speculation/prefetch.html#automated-testing
chromium-bidi implementation: GoogleChromeLabs/chromium-bidi@66d3585

Adding testdriver extension for the speculation module that is mainly to add the prefetch_status_updated event. No commands.

This event will replace the current timeout mechanism for speculation rules prefetch in the wpt prefetch corpus: https://github.com/web-platform-tests/wpt/tree/master/speculation-rules/prefetch

Follow up CLs will be raised to update the above tests to use the new event handling.

@sadym-chromium would you be able to help with rollover for chromium?

[sadym-chromium]

Please add wdspec tests as well. Actually, I'd prefer to have wdspec tests first in a separate PR, but it's up to you.

[srwei]

Please add wdspec tests as well. Actually, I'd prefer to have wdspec tests first in a separate PR, but it's up to you.

Oh I thought webdriver/tests/bidi/external/speculation/prefetch_status_updated/ tests were the wdpsec tests

[sadym-chromium]

Closing and opening to re-run CI

[sadym-chromium]

Sorry, forgot to publish the comment

[sadym-chromium]

Please update expectation for the test for none-chromium browsers. Please refer to https://github.com/web-platform-tests/wpt/blob/master/infrastructure/metadata/infrastructure/testdriver/bidi/emulation/set_geolocation_override.https.html.ini, as a part of #52128.

[srwei]

Thank you! Looks like all checks are passing now

[sadym-chromium]

@web-platform-tests/wpt-core-team please review

[mdmanikhossen013135822-ship-it]

Please patient me

[sadym-chromium]

@jcscottiii could you please take a look?