chore: add SwiftUI View extensions to capture screen view and views in general (postHogViewSeen, postHogScreenView)

[marandaneto]

💡 Motivation and Context

Spike for "semi automatic" or more UX friendly #167

Screen view (applied to the root view)

var body: some Scene {
        WindowGroup {
            ContentView()
                .postHogScreenView() // will infer the class name (ContentView)
        }
    }

Widget view (applied to any view)

Button(action: triggerAction) {
    Text("My Text!")
}.postHogViewSeen("My Button")

Events will be captured when the View triggers the onAppear method

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[marandaneto]

I cannot use type(of: self) here because it will be Button<Text> for all buttons

[daibhin]

Left a comment but up to you to decide