Install dependencies with SPM

[jurajhilje]

Description

Migrate project dependencies from CocoaPods to SPM.

This will have multiple benefits:

• Fix build for iOS Simulator on Apple Silicon, macOS 13, Xcode 14.2
• Remove dependency on CocoaPods
• Improved build stability for future Xcode and macOS versions

More info on issue with building for iOS Simulator:
https://developer.apple.com/forums/thread/673003
https://developer.apple.com/forums/thread/698412
https://developer.apple.com/forums/thread/667156
WireGuard/wireguard-apple#12

QA Notes

This update will require a basic app sanity check.

[jurajhilje]

@gorkapernas Available in 2.9.0 (7).

[jurajhilje]

@gorkapernas Also available in 2.9.0 (12).

[gorkapernas]

Tested several TF versions during the past few weeks, last v2.9.0 (19), devices -> iPhone XR iOS 16.5 and iPad 6 iOS 15.7.1, no issues found related to this ticket.