Adapt to pystencils codegen API changes

src/pystencilssfg/composer/basic_composer.py

src/pystencilssfg/emission/printers.py

src/pystencilssfg/ir/call_tree.py

src/pystencilssfg/ir/postprocessing.py

src/pystencilssfg/ir/source_components.py