Added package initializers to the Amiibo models for testing.

Sources/AmiiboService/Public/Models/Amiibo/Amiibo+Game.swift

@@ -29,6 +29,17 @@ extension Amiibo {
         
         // MARK: Initializers
 
+        /// Initializes this model.
+        package init(
+            identifiers: [String],
+            name: String,
+            usages: [Usage]? = nil
+        ) {
+            self.identifiers = identifiers
+            self.name = name
+            self.usages = usages
+        }
+
         /// Initializes this model from a given payload.
         /// - Parameter payload: A payload that contains the values for the model.
         init(_ payload: Components.Schemas.AmiiboGame) {