fix: Updating the camera frame position when the subviews are laid out

[ruisebas]

Description of changes:

The _LivenessViewController currently centers its camera frame only when its view is loaded, but not when its subviews are laid out. This causes the video feed to appear off-centered when the FaceLivenessDetectorView is stacked with other components (i.e. headers, navigation bars, etc), or when used in a UIHostingController.

This PR fixes this issue by re-centering the camera frame on viewDidLayoutSubviews().

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I'm also removing the liveness package being unnecessary copied as a resource for the example HostApp

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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
• [ ] 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[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 30.48%. Comparing base (75a7c3c) to head (ab1ebf1). Report is 3 commits behind head on main.

Files	Patch %	Lines
...veness/Views/Liveness/LivenessViewController.swift	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #158 +/- ## ========================================== - Coverage 30.51% 30.48% -0.03% ========================================== Files 57 57 Lines 2225 2227 +2 ========================================== Hits 679 679 - Misses 1546 1548 +2 ```

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