Introduce API for wrapping text around and within shapes

[stackotter]

This is an advanced feature that may be difficult to implement under some backends, but a UIKit/AppKit proof of concept shouldn't be too difficult using NSTextContainer.exclusionPaths and whatever the AppKit equivalent is. If possible, it'd be super nice to be able to flow text through the empty space in a view (based on the clip shape of each view.

SwiftUI doesn't have an equivalent API for us to base ours off.

For Gtk we'll likely have to implement a bunch of custom text rendering logic (on top of Pango).

TextFill("Lorem ipsum dolor sit amet ...") {
    HStack {
        Image(...).resizable().frame(width: 100)
        Spacer()
    }

    Spacer().frame(height: 200)

    HStack {
        Spacer()
        Image(...).resizable().frame(width: 100)
    }
}.frame(width: 400)

We likely won't be able to tackle this feature until SwiftCrossUI has a more solid concept of 'clip shape'.