vtkIOGDAL: update to the new module system

IO/GDAL/CMakeLists.txt

-find_package(GDAL REQUIRED)
-mark_as_advanced(GDAL_INCLUDE_DIR GDAL_LIBRARY)
-
-set(GDAL_SRCS vtkGDAL.cxx vtkGDALVectorReader.cxx vtkGDALRasterReader.cxx)
-
-include_directories(${GDAL_INCLUDE_DIRS})
-
-vtk_module_library(vtkIOGDAL ${GDAL_SRCS})
-
-vtk_module_link_libraries(vtkIOGDAL LINK_PRIVATE ${GDAL_LIBRARY})
+vtk_module_find_package(PACKAGE GDAL)
+
+set(classes
+  vtkGDAL
+  vtkGDALVectorReader
+  vtkGDALRasterReader)
+
+vtk_module_add_module(VTK::IOGDAL
+  CLASSES ${classes})
+vtk_module_link(VTK::IOGDAL
+  PRIVATE
+    GDAL::GDAL)

IO/GDAL/Testing/CMakeLists.txt

+vtk_module_test_data(
+  Data/GIS/countries.shp
+  Data/GIS/countries.shx
+  Data/GIS/raster.tif)
+
 add_subdirectory(Cxx)

IO/GDAL/module.cmake

-vtk_module(vtkIOGDAL
-  TEST_DEPENDS
-    vtkTestingCore
-    vtkRenderingOpenGL2
-    vtkTestingRendering
-    vtkInteractionStyle
-  KIT
-    vtkIO
-  DEPENDS
-    vtkCommonCore
-    vtkCommonExecutionModel
-    vtkIOImage
-  PRIVATE_DEPENDS
-    vtkCommonDataModel
-)

IO/GDAL/vtk.module

+NAME
+  VTK::IOGDAL
+LIBRARY_NAME
+  vtkIOGDAL
+KIT
+  VTK::IO
+DEPENDS
+  VTK::CommonCore
+  VTK::CommonExecutionModel
+  VTK::IOImage
+PRIVATE_DEPENDS
+  VTK::CommonDataModel
+TEST_DEPENDS
+  VTK::InteractionStyle
+  VTK::RenderingOpenGL2
+  VTK::TestingCore
+  VTK::TestingRendering