Voice message: variable play back speed

[bmarty]

Content

Follow up PR for #5504 .
Last commits are cleanup.
Also I stored the playback speed index into a data store, since not doing this was causing issue when multiple voice messages was displayed on screen and also difference between the speed displayed on screen and the actual speed of the player. With the data store, everything stays in sync and is persisted across application restart. I do not see the point to persist a different speed depending on the account (in case multi account is used), but we may want to improve this later.

Motivation and context

Give the user the ability to change the playback speed of voice messages.

Screenshots / GIFs

See recorded ones

Tests

• Send 2 voice messages in a room
• Play the voice messages from the timeline.
• Click the playback speed of any message to change the playback speed
• Restart the application
• The last playback speed is restored.

The same tests can be done when playing the voice messages from the media gallery (files tab).

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• 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
• You've made a self review of your PR

[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

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 78.76106% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.35%. Comparing base (3973616) to head (1be2cb1).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...aries/mediaviewer/impl/gallery/ui/VoiceItemView.kt	65.00%	2 Missing and 5 partials ⚠️
...timeline/components/event/TimelineItemVoiceView.kt	80.64%	1 Missing and 5 partials ⚠️
...oid/libraries/voiceplayer/impl/VoicePlayerStore.kt	0.00%	6 Missing ⚠️
...player/impl/DefaultVoiceMessagePresenterFactory.kt	0.00%	2 Missing ⚠️
...s/designsystem/atomic/atoms/PlaybackSpeedButton.kt	95.00%	0 Missing and 1 partial ⚠️
...d/libraries/mediaplayer/impl/DefaultMediaPlayer.kt	0.00%	1 Missing ⚠️
...android/libraries/mediaplayer/impl/SimplePlayer.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5963      +/-   ##
===========================================
- Coverage    81.40%   81.35%   -0.05%     
===========================================
  Files         2535     2538       +3     
  Lines        67626    67682      +56     
  Branches      8669     8677       +8     
===========================================
+ Hits         55049    55065      +16     
- Misses        9367     9404      +37     
- Partials      3210     3213       +3     

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