Feature/valere/invisible crypto feature flag

[BillCarsonFr]

Fixes #3043

Content

Adds a new feature flag to enable invisible crypto. Default is false (can be enabled in dev tool)

When this mode is enabled, device not verified by their owners will not receive decryption keys:

Motivation and context

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

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

[github-actions]

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[bmarty]

LGTM, but you have to fix the issue in building the minimal app.

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 82.62%. Comparing base (b4afc32) to head (bb50d3e).
Report is 25 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3451   +/-   ##
========================================
  Coverage    82.61%   82.62%           
========================================
  Files         1700     1700           
  Lines        40003    40009    +6     
  Branches      4868     4868           
========================================
+ Hits         33049    33056    +7     
  Misses        5233     5233           
+ Partials      1721     1720    -1     

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