Feature/bma/theme switch

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Add option to change the theme: follow system, dark and light.

Motivation and context

Closes #1499

Screenshots / GIFs

See file in the PR

Tests

• Go to advanced settings and change the theme

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

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

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[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (a8fbb88) 63.55% compared to head (5e95da9) 63.57%.

Files	Patch %	Lines
.../preferences/impl/advanced/AdvancedSettingsView.kt	52.00%	8 Missing and 4 partials ⚠️
...nt/android/features/call/ui/ElementCallActivity.kt	0.00%	7 Missing ⚠️
.../io/element/android/libraries/theme/theme/Theme.kt	46.15%	7 Missing ⚠️
...c/main/kotlin/io/element/android/x/MainActivity.kt	0.00%	6 Missing ⚠️
.../preferences/impl/store/DefaultPreferencesStore.kt	0.00%	4 Missing ⚠️
...erences/impl/advanced/AdvancedSettingsPresenter.kt	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1844      +/-   ##
===========================================
+ Coverage    63.55%   63.57%   +0.01%     
===========================================
  Files         1312     1313       +1     
  Lines        34127    34201      +74     
  Branches      7078     7091      +13     
===========================================
+ Hits         21689    21742      +53     
- Misses        9206     9217      +11     
- Partials      3232     3242      +10     

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[jmartinesp]

This is really cool, thanks! I love how simple the implementation is.