[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>

wpilibc/src/main/native/cpp/Compressor.cpp

@@ -204,6 +204,8 @@ void Compressor::ClearAllPCMStickyFaults() {
   }
 }
 
+int Compressor::GetModule() const { return m_module; }
+
 void Compressor::InitSendable(SendableBuilder& builder) {
   builder.SetSmartDashboardType("Compressor");
   builder.AddBooleanProperty(