fix(amp-slikeplayer): add amp param to video URL and fullscreen/GDPR support

[SlikeTech]

Summary

Updates the amp-slikeplayer extension:

• Append &amp=1 to the player iframe src in layoutCallback() (both default and config code paths) so the player can detect it is running inside an AMP context.
• Resolve the player iframe origin and use it as an explicit postMessage target instead of '*'.
• Implement fullscreenEnter() / fullscreenExit() overrides using #core/dom/fullscreen.
• Add GDPR/consent support to amp-slikeplayer.

Files

• extensions/amp-slikeplayer/0.1/amp-slikeplayer.js

Test

• Verified the player loads inside AMP with the amp=1 parameter present in the iframe URL.

[erwinmombay]

@danielrozenberg looks like bundle size has been running for a day now AMP bundle-size / ampproject/bundle-size Started 1d 44m 11s ago i cant seem to find a way to restart these

[danielrozenberg]

Looks like CircleCI hasn't started on this PR at all which is why the bundle size check hasn't started (or finished) - I want to see if closing and reopening this PR will cause it to run CircleCI

[SlikeTech]

@erwinmombay Could you please rerun the CI? The failure doesn't appear to be related to our code changes.

[danielrozenberg]

It looks like we had an issue with one of our dependencies. I just fixed it (#40525) but you'll need to rebase this PR on the latest commit in the main branch, lmk if you need help doing that!

[SlikeTech]

Thanks! @danielrozenberg

[erwinmombay]

@SlikeTech do you mind doing the CLA (if you haven't already)