feat(sl): Add python bindings to Serialization library
- Adds a new top-level package titled tosa_serializer
- New package aims to mirror existing python API as closely as possible
- Adds test for 2GiB support through the new python bindings
- Updates existing tests to use new python bindings
- Update CMake and pyproject files to use skbuild
Co-authored-by: Ryan O'Shea ryan.oshea3@arm.com Co-authored-by: Luke Hutton luke.hutton@arm.com Signed-off-by: Iliyan Georgiev iliyan.georgiev@arm.com