[Python] [Docs] Mention the C Data/Stream Interface in PyArrow Extending

The Arrow C Data/Stream Interface is a relatively lightweight option for developers that want to expose Arrow Arrays to Python users.

It is not mentioned as a recommendation in the documentation on [using pyarrow from C++ code|https://arrow.apache.org/docs/python/integration/extending.html.]

The existing recommendation mentioned is wrapping and unwrapping

I propose adding a section to this page. I would be happy to take that on, if others agree that is a good idea.