`tile` does not handle empty repetitions and scalar input as per array API

[ndgrigorian]

When tile is called on a scalar array with empty repetitions, it returns a 1D array instead of 0D (scalar)

>>> import dpctl,dpctl.tensor as dpt, numpy as np
>>> dpt.tile(dpt.asarray(5), ()).shape
(1,)

>>> np.tile(np.array(5), ()).shape
()