Expose iOS "Auto-Play Animated Images" accessibility setting #177195
Description
Use case
In the Zulip app for iOS, we'd like to check whether the iOS 17+ "Auto-Play Animated Images" setting is enabled, so that when loading an image, we can choose between animated and still versions.
- iOS user doc: https://support.apple.com/guide/iphone/reduce-onscreen-motion-iph0b691d3ed/ios
- iOS developer doc: https://developer.apple.com/documentation/swiftui/environmentvalues/accessibilityplayanimatedimages
Proposal
I propose adding a new field to AccessibilityFeatures, providing this setting's value.
There are already some iOS-only fields, such as AccessibilityFeatures.onOffSwitchLabels.