Rename DualConnectivityBuilder and MedianDualMeshBuilder's files

DualConnectivityBuilder.[hc]pp -> MedianDualConnectivityBuilder.[hc]pp DualMeshBuilder.[hc]pp -> MedianDualMeshBuilder.[hc]pp

src/mesh/MedianDualMeshBuilder.cpp

@@ -52,8 +52,10 @@ MedianDualMeshBuilder::MedianDualMeshBuilder(const IMesh& i_mesh)
     throw NotImplementedError("median dual mesh");
     break;
   }
+    // LCOV_EXCL_START
   default: {
     throw UnexpectedError("invalid mesh dimension: " + std::to_string(i_mesh.dimension()));
   }
+    // LCOV_EXCL_STOP
   }
 }