Initial service implementation for using a PIN code.

[pixlwave]

This PR implements the AppLockService for PIN codes, storing them in the keychain and allowing a grace period for when the app should be unlocked. It does not include TouchID/FaceID support yet, nor is there any UI yet.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against 3b80b09

[codecov]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (6e8dff2) 69.31% compared to head (7028490) 69.32%.
Report is 2 commits behind head on develop.

❗ Current head 7028490 differs from pull request most recent head 3b80b09. Consider uploading reports for the commit 3b80b09 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1912   +/-   ##
========================================
  Coverage    69.31%   69.32%           
========================================
  Files          480      481    +1     
  Lines        32776    32871   +95     
  Branches     15924    15969   +45     
========================================
+ Hits         22720    22788   +68     
- Misses        9470     9495   +25     
- Partials       586      588    +2     

Flag	Coverage Δ
unittests	54.48% <72.47%> (-0.59%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ElementX/Sources/Application/AppSettings.swift	95.45% <100.00%> (+0.14%)	⬆️
...ementX/Sources/Services/AppLock/AppLockTimer.swift	100.00% <100.00%> (ø)
...Sources/Services/Keychain/KeychainController.swift	65.65% <78.57%> (+3.53%)	⬆️
...entX/Sources/Services/AppLock/AppLockService.swift	56.00% <48.78%> (-1.15%)	⬇️

... and 10 files with indirect coverage changes

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[stefanceriu]

🚀

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

No Coverage information
0.0% Duplication