Chore: rework ad props (#4220)

* fix: move ad configuration in source

ios/Video/DataStructures/AdParams.swift

@@ -0,0 +1,18 @@
+struct AdParams {
+    let adTagUrl: String?
+    let adLanguage: String?
+
+    let json: NSDictionary?
+
+    init(_ json: NSDictionary!) {
+        guard json != nil else {
+            self.json = nil
+            adTagUrl = nil
+            adLanguage = nil
+            return
+        }
+        self.json = json
+        adTagUrl = json["adTagUrl"] as? String
+        adLanguage = json["adLanguage"] as? String
+    }
+}