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]

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 ⚠️

Additional details and impacted files

@@            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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