Give locale and theme to Element Call

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Use Element Call with correct theme and language.

Motivation and context

Improve user experience and closes #3079

Screenshots / GIFs

Tests

• Change system theme to dark
• Change system language to not English (for instance French)
• Start a call and observe that Element Call is rendered in dark mode and with the selected language (is supported)

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

[bmarty]

Introduce a LanguageTagProvider because unit test does not like using LocalConfiguration

[github-actions]

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[sonarcloud]

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 SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 75.95%. Comparing base (32b1b6e) to head (4df18ea).

Files	Patch %	Lines
...droid/features/call/impl/ui/LanguageTagProvider.kt	0.00%	3 Missing ⚠️
...droid/features/call/impl/ui/CallScreenPresenter.kt	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3118   +/-   ##
========================================
  Coverage    75.95%   75.95%           
========================================
  Files         1636     1637    +1     
  Lines        38613    38622    +9     
  Branches      7463     7465    +2     
========================================
+ Hits         29328    29335    +7     
- Misses        5396     5397    +1     
- Partials      3889     3890    +1     

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