Refactor storage model to work with native Realm

ios/App/Shared/models/local/LocalPodcastEpisode.swift

@@ -0,0 +1,46 @@
+//
+//  LocalPodcastEpisode.swift
+//  App
+//
+//  Created by Ron Heft on 8/16/22.
+//
+
+import Foundation
+import RealmSwift
+
+class LocalPodcastEpisode: Object, Codable {
+    @Persisted(primaryKey: true) var id: String = UUID().uuidString
+    @Persisted var index: Int = 0
+    @Persisted var episode: String?
+    @Persisted var episodeType: String?
+    @Persisted var title: String = "Unknown"
+    @Persisted var subtitle: String?
+    @Persisted var desc: String?
+    @Persisted var audioFile: AudioFile?
+    @Persisted var audioTrack: AudioTrack?
+    @Persisted var duration: Double = 0
+    @Persisted var size: Int = 0
+    @Persisted(indexed: true) var serverEpisodeId: String?
+    
+    private enum CodingKeys : String, CodingKey {
+        case id
+    }
+    
+    override init() {
+        super.init()
+    }
+    
+    required init(from decoder: Decoder) throws {
+        super.init()
+        
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        id = try values.decode(String.self, forKey: .id)
+    }
+
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(id, forKey: .id)
+    }
+}
+
+