Animated avatars play constantly without option to stop them (WCAG 2.1 / 2.2.2 violation)

### Steps to reproduce

1. use a homeserver with animations enabled e.g. the-apothecary.club
2. join a room with someone who has animated avatar (e.g. #matrix:matrix.org)
3. see someone with an animated avatar say something

### What happened?

The animation plays constantly and there is no way to stop it, so focus moves from the messages to it.

### What did you expect?

Element either doesn't play it constantly or has an option to stop it. See suggestions at https://www.w3.org/WAI/WCAG21/Understanding/pause-stop-hide.html

### Operating system

Fedora 34

### Browser information

Microsoft Edge 93.0.961.11 (Virallinen koontiversio) beta (64-bittinen)

### URL for webapp

develop.element.io