adding header and adding new field

Author: Protik Biswas

vnext/Microsoft.ReactNative/Fabric/Composition/TextInput/WindowsTextInputComponentView.h

@@ -134,6 +134,7 @@ struct WindowsTextInputComponentView
   float m_fontSizeMultiplier{1.0};
   int64_t m_mostRecentEventCount{0};
   int m_nativeEventCount{0};
+  int m_lastSubmitEventCount{-1};  // Track the event count of the last onSubmitEditing
   bool m_comingFromJS{false};
   bool m_comingFromState{false};
   int m_cDrawBlock{0};