Ensure screen does not turn off when playing a video (#1519)

[bmarty]

Type of change

• Feature
• Bugfix / Enhancement
• Technical
• Other :

Content

Keep screen on while playing a video

Motivation and context

Fixes #1519

Screenshots / GIFs

Tests

• Set timeout to 15s
• Play a longer video with the app
• Observe that the screen does not sleep.
• Pause the playback -> the screen go to sleep after 15s

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/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• 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

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[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (a2601c0) 59.04% compared to head (c3bc44b) 59.02%.
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1556      +/-   ##
===========================================
- Coverage    59.04%   59.02%   -0.02%     
===========================================
  Files         1167     1168       +1     
  Lines        30525    30536      +11     
  Branches      6248     6253       +5     
===========================================
+ Hits         18024    18025       +1     
- Misses        9802     9812      +10     
  Partials      2699     2699              

Files	Coverage Δ
...s/messages/impl/media/local/LocalMediaViewState.kt	66.66% <100.00%> (+6.66%)	⬆️
...atures/messages/impl/media/local/LocalMediaView.kt	53.90% <0.00%> (-0.86%)	⬇️
...droid/libraries/designsystem/utils/KeepScreenOn.kt	0.00% <0.00%> (ø)

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