Provide distinct cache directory to the Rust SDK.

[bmarty]

Content

Provide distinct cache directory to the Rust SDK.

Motivation and context

Fix a TODO and let the system be able to delete cache data if necessary (good practice)

Screenshots / GIFs

Previously the event-cache files were stored in the sessions/id folder.

Note: this PR does not delete the existing event-cache files, but user will have to logout soon anyway. AppMigration06 moves the cache files now.

Tests

• Install the application as an upgrade of an existing installation and the app should start normally.
• clear cache from the developer option
• clear cache from the system

Everything should work as expected.

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]

@Hywan can you have a look on this PR please? Since the application is playing with files created by the SDK, it would be nice if you can confirm that what is done is fine. Please let me know if you have any question. Thanks!

[Hywan]

It's nice to put the cache in a different directory than the store, so that it makes really clear one can be dropped or not, and avoid accident. I think it's good.

[ganfra]

LGTM, thanks for this

[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 17.85714% with 23 lines in your changes missing coverage. Please review.

Project coverage is 82.60%. Comparing base (31d0621) to head (951dff8).
Report is 16 commits behind head on develop.

Files with missing lines	Patch %	Lines
...atures/migration/impl/migrations/AppMigration06.kt	0.00%	23 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3370      +/-   ##
===========================================
- Coverage    82.64%   82.60%   -0.05%     
===========================================
  Files         1684     1685       +1     
  Lines        39507    39535      +28     
  Branches      4806     4810       +4     
===========================================
+ Hits         32650    32656       +6     
- Misses        5175     5198      +23     
+ Partials      1682     1681       -1     

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