[hal] Update runtime enum to allow selecting roborio 2 (#3565)

In some cases, knowing roborio 2 might be useful. This also creates a higher level enum that might be usable later for the discussion on more complex runtime types.

wpilibc/src/main/native/include/frc/RobotBase.h

@@ -15,6 +15,7 @@
 #include <wpi/mutex.h>
 
 #include "frc/Errors.h"
+#include "frc/RuntimeType.h"
 
 namespace frc {
 
@@ -211,6 +212,13 @@ class RobotBase {
 
   virtual void EndCompetition() = 0;
 
+  /**
+   * Get the current runtime type.
+   *
+   * @return Current runtime type.
+   */
+  static RuntimeType GetRuntimeType();
+
   /**
    * Get if the robot is real.
    *