Add support for bitwise operators and integer division

src/pystencils/backend/ast/expressions.py

src/pystencils/backend/emission.py

src/pystencils/backend/kernelcreation/freeze.py

src/pystencils/backend/kernelcreation/typification.py

src/pystencils/sympyextensions/integer_functions.py

tests/nbackend/kernelcreation/test_freeze.py

tests/nbackend/kernelcreation/test_typification.py

tests/nbackend/test_code_printing.py