__str__ and __repr__ of array_api_strict arrays

[ev-br]

Currently, both str and repr ---- I guess --- inherit from numpy, thus 0D arrays look like scalars when printed:

In [16]: xp.asarray(1).__repr__()
Out[16]: 'Array(1, dtype=array_api_strict.int64)'

In [17]: xp.asarray(1).__str__()
Out[17]: '1'

For ndim > 1 str is also inherited from numpy, and printed arrays look like lists only without commas.

In [18]: xp.asarray([1, 2, 3]).__str__()
Out[18]: '[1 2 3]'

In [19]: xp.asarray([1, 2, 3]).__repr__()
Out[19]: 'Array([1, 2, 3], dtype=array_api_strict.int64)'

It might make sense to make __str__ identical to __repr__, if only to some confusion.