Implement month separator for the Gallery, and improve date rendering.

[bmarty]

Content

Implement month separator for the Gallery.
Improve day separator rendering in the timeline.
Use Today, Yesterday, and the name of the day if less than 7 days and do not render the year for the current year. Improve date format for the media viewer.
Rework how date and time are computed.
ActionListView: Time can take more space, so update the layout.

Motivation and context

Part of the work on the media gallery + Closes #2238

Screenshots / GIFs

Tests

• Run the app in your current locale and check that all the date across the application look good.
• Change the language of the phone / of the app and observe that the app uses the new languages (especially to render date and time).

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 91.59892% with 31 lines in your changes missing coverage. Please review.

Project coverage is 83.07%. Comparing base (5515c93) to head (a99eecd).
Report is 30 commits behind head on develop.

Files with missing lines	Patch %	Lines
...braries/dateformatter/impl/LocaleChangeObserver.kt	0.00%	13 Missing ⚠️
...ctories/virtual/TimelineItemDaySeparatorFactory.kt	33.33%	4 Missing ⚠️
...ies/mediaviewer/impl/gallery/VirtualItemFactory.kt	20.00%	4 Missing ⚠️
...oid/libraries/dateformatter/impl/DateFormatters.kt	78.57%	2 Missing and 1 partial ⚠️
...libraries/dateformatter/impl/DateTimeFormatters.kt	90.90%	0 Missing and 2 partials ⚠️
...tter/impl/previews/DateFormatterModeViewPreview.kt	98.48%	0 Missing and 1 partial ⚠️
...teformatter/impl/previews/PreviewStringProvider.kt	80.00%	1 Missing ⚠️
...s/mediaviewer/impl/DefaultMediaViewerEntryPoint.kt	0.00%	1 Missing ⚠️
...ediaviewer/impl/details/MediaDetailsBottomSheet.kt	0.00%	0 Missing and 1 partial ⚠️
...mediaviewer/impl/local/AndroidLocalMediaFactory.kt	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4026      +/-   ##
===========================================
+ Coverage    83.01%   83.07%   +0.06%     
===========================================
  Files         1845     1856      +11     
  Lines        47699    47997     +298     
  Branches      5632     5642      +10     
===========================================
+ Hits         39595    39875     +280     
- Misses        6108     6125      +17     
- Partials      1996     1997       +1     

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[ganfra]

LGTM, thanks!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud