migrate test suite

tests/_old/test_base_pointer_specification.py

tests/_old/test_config.py

tests/_old/test_create_kernel_config.py

tests/_old/test_global_definitions.py

tests/_old/test_jacobi_cbackend.py

tests/_old/test_json_backend.py

tests/_old/test_json_serializer.py

tests/_old/test_move_constant_before_loop.py

tests/_old/test_printing.py

tests/_old/test_source_code_comment.py

tests/_old/test_transformations.py

tests/_old/test_type_interference.py

tests/_old/test_types.py

tests/_todo/test_conditional_vec.py

tests/_todo/test_dot_printer.ipynb

tests/_todo/test_dot_printer.py

tests/_todo/test_fvm.py

tests/_todo/test_indexed_kernels.py

tests/_todo/test_loop_cutting.py

tests/_todo/test_modulo.py