Top level array namespace

[tomwhite]

This is a part of #307, which simply adds the array API public members to the top-level cubed namespace. Later (probably after the next release), I'd like to deprecate everything in cubed.array_api for removal in the future.

Any thoughts @TomNicholas?

[TomNicholas]

This seems sensible, my main question is just whether this would prevent it working with hypothesis for any reason (see #307 (comment))

[tomwhite]

This seems sensible, my main question is just whether this would prevent it working with hypothesis for any reason (see #307 (comment))

Seems to work fine:

>>> from hypothesis.extra.array_api import make_strategies_namespace
>>> import cubed as xp
>>> xps = make_strategies_namespace(xp)
>>> xps.arrays(xp.int8, (2, 3)).example()
cubed.Array<array-169, shape=(2, 3), dtype=int8, chunks=((2,), (3,))>
>>> import cubed.array_api as xp
>>> xps = make_strategies_namespace(xp)
>>> xps.arrays(xp.int8, (2, 3)).example()
cubed.Array<array-2396, shape=(2, 3), dtype=int8, chunks=((2,), (3,))>