Add segmented BetterPickerStyle

Notes

• Create a BetterPickerStyle that mimics Apple's PickerStyle.segmented with the ability to customize styles on the View.
• Resolve MainActor isolation warnings in test cases.
• Update file headers to 2024

What's Changed

• Update header dates via swiftformat by @r-jarvis in #9
• Feature/fix test warnings by @r-jarvis in #12
• Feature/segmented picker animation by @r-jarvis in #10

New Contributors

• @r-jarvis made their first contribution in #9

Full Changelog: 2.1.4...3.1.0