Import of deprecated dpnp.dparray class caused exception

[antonwolfy]

A dpnp.dparray class is actually obsolete and needs to be declared as deprecated. There is dpnp.dpnp_array class which has to be used instead. So the PR implements a deprecation warning for dpnp.dparray class.
Another issue which is fixed by the PR is an exception raised during import of dpnp.dparray, like in below example:

> python -c "import dpnp; import dpnp.dparray"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "dpnp/dparray.pyx", line 40, in init dpnp.dparray
    from dpnp.dpnp_iface import *
TypeError: Cannot overwrite C type array

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[oleksandr-pavlyk]

Is importing of this module fixed by changes on lines 52-55 without removal of from dpnp.dpnp_iface import *?

[antonwolfy]

No, it didn't help, the same exception raised.