[sim] Add WPILib-class-taking constructors (#2538)

When not direct mapped, make index constructors private and add factory
functions for channel and index.

Co-authored-by: GabrielDeml <gabrielddeml@gmail.com>

hal/src/main/native/sim/mockdata/AnalogTriggerDataInternal.h

@@ -31,6 +31,7 @@ class AnalogTriggerData {
   SimDataValue<HALSIM_AnalogTriggerMode, MakeTriggerModeValue,
                GetTriggerModeName>
       triggerMode{static_cast<HALSIM_AnalogTriggerMode>(0)};
+  std::atomic<int32_t> inputPort;
 
   virtual void ResetData();
 };