Support PEP688 for buffers and in particular numpy array

[tonybaloney]

The buffer protocol offers a lower-level interface to access the contents of a buffer structure like bytearray, array.array and numpy's ndarray.

The C API for this protocol is defined in
https://docs.python.org/3/c-api/buffer.html

Typing support came in 3.12 for collections.abc.Buffer but is available in typing_extensions.Buffer. Neither are generic, although numpy has a typing extension, none of those generics are suitable https://numpy.org/devdocs/reference/typing.html#numpy.typing.ArrayLike

We need to:

• Detect a 'Buffer' as a result type
• Have an API for creating a buffer from a PyObject
• Have an API for yeilding data from that buffer
• Release the buffer safely

I think this would provide a faster interface for getting data out of large numpy arrays rather than using .tolist()