add dim to Mesh2D & Mesh3D

Author: eigemx

src/neatmesh/_mesh.py

@@ -20,6 +20,7 @@ def __init__(self, reader: MeshReader2D) -> None:
         self._analyzer.analyze_non_ortho()
 
         self.meshio_cell_blocks = self._reader.cell_blocks
+        self.dim = 2
         self.points = self._analyzer.points
 
         self.edges = self._analyzer.edges
@@ -65,6 +66,7 @@ def __init__(self, reader: MeshReader3D) -> None:
         self._analyzer.analyze_non_ortho()
 
         self.meshio_cell_blocks = self._reader.cell_blocks
+        self.dim = 3
         self.points = self._analyzer.points
 
         # faces data