Add support for mandatory backup or passphrase from .well-known configuration

[jmartinesp]

Fixes #6133 .

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Adds a feature to setup mandatory key backup or passphrase for all users based on the .well-known configuration of the home server.

Tests

• Set up a server with the following configuration changes:

"io.element.e2ee": {
  "secure_backup_required": true
  "secure_backup_setup_methods": ["passphrase"] (optional, defaults to "all methods accepted")
}

• Create an account in it.

Tested devices

• Physical
• Emulator
• OS version(s): 12.

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-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-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
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[github-actions]

Unit Test Results

142 files  ±0  142 suites  ±0   2m 32s ⏱️ +2s
229 tests ±0  229 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
760 runs  ±0  760 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 130ed63. ± Comparison against base commit 483b1ab.

♻️ This comment has been updated with latest results.

[jmartinesp]

It seems like I missed some code needed to make verification also mandatory if this config is used, it's included now.

[sonarqubecloud]

SonarCloud Quality Gate failed.   

2 Bugs
0 Vulnerabilities
0 Security Hotspots
5 Code Smells

No Coverage information
0.0% Duplication

[fedrunov]

LGTM, thanks for changes

[github-actions]

Matrix SDK

Integration Tests Results:

• [org.matrix.android.sdk.session]
  = passed=20 failures=0 errors=0 skipped=3
• [org.matrix.android.sdk.account]
  = passed=3 failures=0 errors=0 skipped=2
• [org.matrix.android.sdk.internal]
  = passed=27 failures=1 errors=0 skipped=1
• [org.matrix.android.sdk.ordering]
  = passed=16 failures=0 errors=0 skipped=0
• [org.matrix.android.sdk.PermalinkParserTest]
  = passed=2 failures=0 errors=0 skipped=0