video: add AVPlayerView, a simple wrapper for AVPlayerViewController

Closes: https://github.com/damus-io/damus/pull/1539
Reviewed-by: William Casarin <jb55@jb55.com>
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Views/Video/AVPlayerView.swift

@@ -0,0 +1,31 @@
+//
+//  AVPlayerView.swift
+//  damus
+//
+//  Created by Bryan Montz on 9/4/23.
+//
+
+import Foundation
+import AVKit
+import SwiftUI
+
+struct AVPlayerView: UIViewControllerRepresentable {
+    
+    let player: AVPlayer
+    
+    func makeUIViewController(context: Context) -> AVPlayerViewController {
+        AVPlayerViewController()
+    }
+    
+    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: Context) {
+        if uiViewController.player == nil {
+            uiViewController.player = player
+            player.play()
+        }
+    }
+    
+    static func dismantleUIViewController(_ uiViewController: AVPlayerViewController, coordinator: ()) {
+        uiViewController.player?.pause()
+        uiViewController.player = nil
+    }
+}