change import to RCTBridgeProxy to forward declaration (facebook#43313)

Summary:

Changelog: [Internal]

we can simplify the build graph here

Differential Revision: D54404844

packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/ReactCommon/RCTTurboModuleManager.h

@@ -10,14 +10,14 @@
 #import <memory>
 
 #import <React/RCTBridgeModuleDecorator.h>
-#import <React/RCTBridgeProxy.h>
 #import <React/RCTDefines.h>
 #import <React/RCTTurboModuleRegistry.h>
 #import <ReactCommon/RuntimeExecutor.h>
 #import <ReactCommon/TurboModuleBinding.h>
 
 #import "RCTTurboModule.h"
 
+@class RCTBridgeProxy;
 @class RCTTurboModuleManager;
 
 @protocol RCTTurboModuleManagerDelegate <NSObject>