Refactor storage model to work with native Realm

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

@@ -0,0 +1,41 @@
+//
+//  FileMetadata.swift
+//  App
+//
+//  Created by Ron Heft on 8/16/22.
+//
+
+import Foundation
+import RealmSwift
+
+class FileMetadata: EmbeddedObject, Codable {
+    @Persisted var filename: String = ""
+    @Persisted var ext: String = ""
+    @Persisted var path: String = ""
+    @Persisted var relPath: String = ""
+    
+    private enum CodingKeys : String, CodingKey {
+        case filename, ext, path, relPath
+    }
+    
+    override init() {
+        super.init()
+    }
+    
+    required init(from decoder: Decoder) throws {
+        super.init()
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        filename = try values.decode(String.self, forKey: .filename)
+        ext = try values.decode(String.self, forKey: .ext)
+        path = try values.decode(String.self, forKey: .path)
+        relPath = try values.decode(String.self, forKey: .relPath)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(filename, forKey: .filename)
+        try container.encode(ext, forKey: .ext)
+        try container.encode(path, forKey: .path)
+        try container.encode(relPath, forKey: .relPath)
+    }
+}