Foundation Classes - Migrate Bnd_B2x and Bnd_B3x from macro-template to C++ templates (#820)

- Replaced macro-based template system with C++ templates for `Bnd_B2` and `Bnd_B3` classes
- Fixed incorrect use of Y-coordinate instead of Z-coordinate in transformation methods
- Added comprehensive GTest test coverage for both 2D and 3D bounding box classes

src/ModelingAlgorithms/TKMesh/BRepMesh/BRepMesh_Delaun.cxx

@@ -22,7 +22,7 @@
 
 #include <Precision.hxx>
 #include <Bnd_Box2d.hxx>
-#include <Bnd_B2d.hxx>
+#include <Bnd_B2.hxx>
 
 #include <BRepMesh_SelectorOfDataStructureOfDelaun.hxx>
 

src/ModelingAlgorithms/TKMesh/BRepMesh/BRepMesh_Delaun.hxx

@@ -26,7 +26,6 @@
 #include <BRepMesh_GeomTool.hxx>
 #include <Message_ProgressRange.hxx>
 
-class Bnd_B2d;
 class Bnd_Box2d;
 class BRepMesh_Vertex;
 

src/ModelingAlgorithms/TKMesh/IMeshData/IMeshData_Types.hxx

@@ -32,7 +32,7 @@
 #include <NCollection_UBTreeFiller.hxx>
 #include <NCollection_IndexedMap.hxx>
 #include <BRepMesh_Vertex.hxx>
-#include <Bnd_B2d.hxx>
+#include <Bnd_B2.hxx>
 #include <BRepMesh_Circle.hxx>
 #include <BRepMesh_Triangle.hxx>
 #include <BRepMesh_PairOfIndex.hxx>