py/stream: Implement 2- and 3-arg write() method as an extension to CPython.

3-arg form:

stream.write(data, offset, length)

2-arg form:

stream.write(data, length)

These allow efficient buffer writing without incurring extra memory
allocation for slicing or creating memoryview() object, what is
important for low-memory ports.

All arguments must be positional. It might be not so bad idea to standardize
on 3-arg form, but 2-arg case would need check and raising an exception
anyway then, so instead it was just made to work.

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