Reduce header dependencies in RuntimeScheduler (#39056)

Summary:
Pull Request resolved: #39056

## Changelog:
[Internal] - Reduce header dependencies in RuntimeScheduler

## Facebook:

Reviewed By: sammy-SC

Differential Revision: D48429842

fbshipit-source-id: fef1883cf1bd102f14ca5708715783db3a8e826d

Author: cipolleschi

packages/react-native/ReactCommon/react/renderer/runtimescheduler/RuntimeSchedulerBinding.cpp

@@ -9,6 +9,7 @@
 #include <ReactCommon/SchedulerPriority.h>
 #include "SchedulerPriorityUtils.h"
 #include "primitives.h"
+#include "RuntimeScheduler.h"
 
 #include <chrono>
 #include <memory>

packages/react-native/ReactCommon/react/renderer/runtimescheduler/RuntimeSchedulerBinding.h

@@ -8,10 +8,11 @@
 #pragma once
 
 #include <jsi/jsi.h>
-#include <react/renderer/runtimescheduler/RuntimeScheduler.h>
 
 namespace facebook::react {
 
+class RuntimeScheduler;
+
 /*
  * Exposes RuntimeScheduler to JavaScript realm.
  */

packages/react-native/ReactCommon/react/renderer/runtimescheduler/RuntimeSchedulerCallInvoker.cpp

@@ -6,6 +6,7 @@
  */
 
 #include "RuntimeSchedulerCallInvoker.h"
+#include "RuntimeScheduler.h"
 
 #include <utility>
 

packages/react-native/ReactCommon/react/renderer/runtimescheduler/RuntimeSchedulerCallInvoker.h

@@ -8,10 +8,10 @@
 #pragma once
 
 #include <ReactCommon/CallInvoker.h>
-#include <react/renderer/runtimescheduler/RuntimeScheduler.h>
 
 namespace facebook::react {
 
+class RuntimeScheduler;
 /*
  * Exposes RuntimeScheduler to native modules. All calls invoked on JavaScript
  * queue from native modules will be funneled through RuntimeScheduler.