[hal,wpilib] Move Alert to HAL (#8646)

SystemCore implementation is not yet connected to MRCComm.

hal/src/main/native/cpp/jni/simulation/AlertDataJNI.hpp

@@ -0,0 +1,12 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <jni.h>
+
+namespace wpi::hal::sim {
+bool InitializeAlertDataJNI(JNIEnv* env);
+void FreeAlertDataJNI(JNIEnv* env);
+}  // namespace wpi::hal::sim