Fix crash when changing the push provider in nightlies

[jmartinesp]

Content

• Makes sure we don't obfuscate Metro related code. It's already convoluted enough as it is, and it doesn't expose anything.
• Fixes the crash by changing JsonProvider into a typealias.
• Does some cleanup in related DI code.

Motivation and context

Fixes #5947.

Tests

In a nightly/release version of the app, change the push provider to ntfy or Sunup. If it doesn't crash, it's fixed.

Tested devices

• Physical
• Emulator
• OS version(s): 16

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

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.45%. Comparing base (00dcbf4) to head (57f8fbe).
⚠️ Report is 19 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5951      +/-   ##
===========================================
+ Coverage    81.41%   81.45%   +0.04%     
===========================================
  Files         2537     2536       -1     
  Lines        67569    67568       -1     
  Branches      8643     8643              
===========================================
+ Hits         55009    55036      +27     
+ Misses        9368     9340      -28     
  Partials      3192     3192              

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[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

[surakin]

I can confirm this fixed the startup crash i had