Add createEndOfStaveCard method to TRKLayer

Added a method to create the end-of-stave card for the A-side.

Author: altsybee

Detectors/Upgrades/ALICE3/TRKFT3/TRK/simulation/include/TRKSimulation/TRKLayer.h

@@ -118,6 +118,8 @@ class TRKMLLayer : public TRKSegmentedLayer
   void createLayer(TGeoVolume* motherVolume) override;
 
  private:
+  TGeoVolume* createEndOfStaveCard(); // A-side (+z) end-of-stave card, in front of the conn disk
+
   float mStaggerOffset;
 
   static constexpr double sStaveWidth = constants::ML::width;