Refactor storage model to work with native Realm

ios/App/Shared/models/server/AudioFile.swift

@@ -0,0 +1,38 @@
+//
+//  AudioFile.swift
+//  App
+//
+//  Created by Ron Heft on 8/16/22.
+//
+
+import Foundation
+import RealmSwift
+
+class AudioFile: EmbeddedObject, Codable {
+    @Persisted var index: Int?
+    @Persisted var ino: String = ""
+    @Persisted var metadata: FileMetadata?
+    
+    private enum CodingKeys : String, CodingKey {
+        case index, ino, metadata
+    }
+    
+    override init() {
+        super.init()
+    }
+    
+    required init(from decoder: Decoder) throws {
+        super.init()
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        index = try? values.decode(Int.self, forKey: .index)
+        ino = try values.decode(String.self, forKey: .ino)
+        metadata = try? values.decode(FileMetadata.self, forKey: .metadata)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(index, forKey: .index)
+        try container.encode(ino, forKey: .ino)
+        try container.encode(metadata, forKey: .metadata)
+    }
+}