Update `SwiftUI` libraries to vanilla SwiftUI + support all platforms

[marinofelipe]

Whenever Apple provides us with API for fully controlling TextFields selected text range, it will open the door for a plain vanilla SwiftUI version of CurrencyTextField and its libraries.

As additional benefits all TextField modifiers will work nicely with CurrencyTextField, and support for all platforms will be possible given that importing UIKit won't be needed anymore.

Let's see what WWDC and the next iteration of SwiftUI will give us 🤞 !

Dependecies / References

Apple 😜🙏