[sim] Provide method to set the runtime type (#2539)

This is needed for extensions that effectively access real hardware and
want to disable the "simulation" parts of user code.

hal/src/main/native/include/simulation/SimHooks.h

@@ -12,6 +12,8 @@
 namespace frc {
 namespace sim {
 
+void SetRuntimeType(HAL_RuntimeType type) { HALSIM_SetRuntimeType(type); }
+
 void WaitForProgramStart() { HALSIM_WaitForProgramStart(); }
 
 void SetProgramStarted() { HALSIM_SetProgramStarted(); }