Add python example w/ cffi-generated bindings
Features:
- Seamless copies between tensors (ggml & numpy alike) with automatic (de/re)quantization
- Access to full C API (incl. CUDA, MPI, OpenCL, Metal, alloc... and any local API changes)
- Trivial regeneration with `python regenerate.py` (uses llama.cpp headers by default, README.md for options)
