* Add floating date indicator while scrolling the timeline (#6433)
* Add `FeatureFlags.FloatingDateBadge`. This enables displaying the floating date badge in the timeline as you scroll.
* Don't display the floating badge if the timeline isn't reversed. Otherwise, this will affect talkback users and break the existing navigation
* Use `TimelineItem.formattedDate()` to get the date to display. Always try finding the closest one (usually it will be just the 1st one we try).
* Align designs with iOS. Also fix shadows in fade animation by adding some paddings.
* Update screenshots
---------
Co-authored-by: Gianluca Iavicoli <gianluca.iavicoli04@gmail.com>
Co-authored-by: ElementBot <android@element.io>
b340e85f83