copy the FluentUILib target and create a new FluentUILibExp target.

[harrieshin]

moving some of our SwiftUI implementation to only be including on FluentUILibExp target not fluentUIlib. ToDo: adjust demo app linking

Platforms Impacted

• [x] iOS
• [ ] macOS

Description of changes

(a summary of the changes made, often organized by file)

Verification

(how the change was tested, including both manual and automated tests)

Before	After
Screenshot or description before this change	Screenshot or description with this change

Pull request checklist

This PR has considered:

• [ ] Light and Dark appearances
• [ ] iOS supported versions (all major versions greater than or equal current target deployment version)
• [ ] VoiceOver and Keyboard Accessibility
• [ ] Internationalization and Right to Left layouts
• [ ] Different resolutions (1x, 2x, 3x)
• [ ] Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• [ ] iPad Pointer interaction
• [ ] SwiftUI consumption (validation or new demo scenarios needed)
• [ ] Objective-C exposure (provide it only if needed)

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