feat(FaceLivenessDetectionError): Adding new .cameraNotAvailable error.

[sebaland]

Description of changes:

This PR adds FaceLivenessDetectionError.cameraNotAvailable, which is reported when there's a problem accessing the camera that is not caused by lack of user permissions.

The underlying websocket close code for this error remains 4006, as per the contract with the Rekognition service.

Check points: (check or cross out if not relevant)

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
  • TBA
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 30.44%. Comparing base (8b3f63a) to head (387bff2).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...ess/Views/Liveness/FaceLivenessDetectionView.swift	0.00%	2 Missing ⚠️
...iews/Liveness/FaceLivenessDetectionViewModel.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
- Coverage   30.48%   30.44%   -0.05%     
==========================================
  Files          57       57              
  Lines        2227     2230       +3     
==========================================
  Hits          679      679              
- Misses       1548     1551       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.