Cover react/renderer/scheduler with Stable API guards

Summary:
Classifies `react/renderer/scheduler:scheduler` as a "for frameworks" target under the three-tier C++ stable API visibility model. Consumers that opt into `RN_STRICT_API` now get a warning if they include its headers directly, which they can acknowledge with `RN_ALLOW_FRAMEWORKS`; without that flag the guards are inert, so no existing build changes behaviour.

Changelog: [Internal]

Differential Revision: D116909091

Author: j-piasecki

packages/react-native/ReactCommon/react/renderer/scheduler/CMakeLists.txt

@@ -17,6 +17,7 @@ target_link_libraries(react_renderer_scheduler
         folly_runtime
         glog
         jsi
+        react_cxxstableapi
         react_debug
         react_featureflags
         react_performance_cdpmetrics

packages/react-native/ReactCommon/react/renderer/scheduler/InspectorData.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <vector>
 
 namespace facebook::react {

packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <atomic>
 #include <memory>
 #include <vector>

packages/react-native/ReactCommon/react/renderer/scheduler/SchedulerDelegate.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <memory>
 
 #include <react/renderer/core/ReactPrimitives.h>

packages/react-native/ReactCommon/react/renderer/scheduler/SchedulerToolbox.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <memory>
 
 #include <ReactCommon/RuntimeExecutor.h>

packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceHandler.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <memory>
 #include <shared_mutex>
 

packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/FrameworksGuard.h>
+
 #include <mutex>
 #include <optional>
 #include <shared_mutex>