Feat add python c binding

[TomBurdge]

The Feature

• Add python binding for for fulll public dockpack API exposed in the command line through C API.
• Use CFFI for FFI from python & Maturin for platform-specific & python-relevant bindgen automation (not Py03).
• justfile (like a Makefile) that can be used with uv to test the bindings. One fails, but this is consistent with the current state of the rust tests. Will be fixed by allowing configuring a remote auth in the tests on a separate PR.

Future work:

• Maturin can be used for lots of builds to distribute this to PyPI with a github action.
• Add CI that distributes this to PyPi.