Adding autoplay support in embed block

[sdmcraft]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--franklin-assets-selector--hlxsites.hlx.live/video-auto-play-demo
• After: https://autoplay--franklin-assets-selector--hlxsites.hlx.live/video-auto-play-demo

[aem-code-sync[bot]]

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/video-auto-play-demo