introduce RCTHostCreationHelpers (#37328)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/37328

Changelog: [Internal]
in this diff, i introduced a C function to be used to create RCTHost that obfuscates away all the C++ arguments. i expect this to be the API that the vast majority of the community will use to create `RCTHost`.

Reviewed By: cipolleschi

Differential Revision: D45678970

fbshipit-source-id: e3479db1bb68d93b3ee2f02598413d2080bb5ea9

packages/react-native/ReactCommon/react/bridgeless/platform/ios/Core/RCTHostCreationHelpers.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <React/RCTDefines.h>
+#import <UIKit/UIKit.h>
+
+#import "RCTHost.h"
+
+@class RCTHost;
+
+@protocol RCTHostDelegate;
+@protocol RCTTurboModuleManagerDelegate;
+
+NS_ASSUME_NONNULL_BEGIN
+
+RCT_EXTERN_C_BEGIN
+
+RCTHost *RCTHostCreateDefault(
+    id<RCTHostDelegate> hostDelegate,
+    id<RCTTurboModuleManagerDelegate> turboModuleManagerDelegate,
+    RCTHostJSEngineProvider jsEngineProvider);
+
+RCT_EXTERN_C_END
+
+NS_ASSUME_NONNULL_END

packages/react-native/ReactCommon/react/bridgeless/platform/ios/Core/RCTHostCreationHelpers.mm

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RCTHostCreationHelpers.h"
+
+RCTHost *RCTHostCreateDefault(
+    id<RCTHostDelegate> hostDelegate,
+    id<RCTTurboModuleManagerDelegate> turboModuleManagerDelegate,
+    RCTHostJSEngineProvider jsEngineProvider)
+{
+  return [[RCTHost alloc] initWithHostDelegate:hostDelegate
+                    turboModuleManagerDelegate:turboModuleManagerDelegate
+                           bindingsInstallFunc:nullptr
+                              jsEngineProvider:jsEngineProvider];
+}