[RNMobile] Fix encoding of MediaInfo metadata property (iOS) (#49304

)

* Encode metadata property manually in `encodeForJS`

* Remove `encode` from MediaInfo

We are not customizing the encoding of the MediaInfo so we can rely on the default implementation.

* Change metadata type to Dictionary

packages/react-native-bridge/ios/GutenbergBridgeDelegate.swift

@@ -5,34 +5,21 @@ public struct MediaInfo: Encodable {
     public let title: String?
     public let caption: String?
     public let alt: String?
-    public let metadata: Encodable
+    public let metadata: [String: Any]
 
     private enum CodingKeys: String, CodingKey {
-        case id, url, type, title, caption, alt, metadata
+        case id, url, type, title, caption, alt
     }
 
-    public init(id: Int32?, url: String?, type: String?, caption: String? = nil, title: String? = nil, alt: String? = nil, metadata: Encodable? = nil) {
+    public init(id: Int32?, url: String?, type: String?, caption: String? = nil, title: String? = nil, alt: String? = nil, metadata: [String: Any] = [:]) {
         self.id = id
         self.url = url
         self.type = type
         self.caption = caption
         self.title = title
         self.alt = alt
-        self.metadata = metadata ?? [:] as [String: String]
+        self.metadata = metadata
     }
-
-    public func encode (to encoder: Encoder) throws
-    {
-        var container = encoder.container (keyedBy: CodingKeys.self)
-        try container.encode (id, forKey: .id)
-        try container.encode (url, forKey: .url)
-        try container.encode (type, forKey: .type)
-        try container.encode (title, forKey: .title)
-        try container.encode (caption, forKey: .caption)
-        try container.encode (alt, forKey: .alt)
-        var metadataContainer = container.nestedUnkeyedContainer(forKey: .metadata)
-        try metadata.encode(to: metadataContainer.superEncoder())
-     }
 }
 
 /// Definition of capabilities to enable in the Block Editor

packages/react-native-bridge/ios/RNReactNativeGutenbergBridge.swift

@@ -468,12 +468,13 @@ extension MediaInfo {
     func encodeForJS() -> [String: Any] {
         guard
             let data = try? JSONEncoder().encode(self),
-            let jsonObject = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else
+            var jsonObject = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else
         {
             assertionFailure("Encoding of MediaInfo failed")
             return [String: Any]()
         }
 
+        jsonObject["metadata"] = self.metadata
         return jsonObject
     }
 }