[iOS] fix TestPlayer test helper dependency

ios/packages/core/Sources/Types/Assets/BaseAssetRegistry.swift

@@ -175,7 +175,7 @@ open class BaseAssetRegistry<WrapperType>: PlayerRegistry where
 }
 
 public struct RegistryDecodeShim<Asset>: Decodable {
-    let asset: Asset
+    public let asset: Asset
 
     public init(from decoder: Decoder) throws {
         let decodeFunction: DecodeAssetFunction<Asset> = try decoder.getDecodeAssetFunction()

ios/packages/core/Sources/Types/Core/DataController.swift

@@ -14,7 +14,7 @@ A wrapper around the JS DataController in the core player
 open class BaseDataController {
 
     /// The JSValue that backs this wrapper
-    let value: JSValue
+    public let value: JSValue
 
     /**
     Construct a DataController from a JSValue

ios/packages/core/Sources/utilities/JSUtilities.swift

@@ -17,7 +17,7 @@ public class JSUtilities {
      - parameters:
         - context: The context to polyfill
      */
-    static func polyfill(_ context: JSContext) {
+    public static func polyfill(_ context: JSContext) {
         let setTimeout: @convention(block) (JSValue?, JSValue?) -> Void = { (function, timeout) in
             guard let function = function, let timeout = timeout?.toInt32() else { return }
             DispatchQueue

ios/packages/test-utils-core/Sources/AssetTestHelper.swift

@@ -1,5 +1,4 @@
 import Foundation
-import XCTest
 import JavaScriptCore
 
 extension JSContext {