dpnp.where() doesn`t work with 1 argument

[vlad-perevezentsev]

Now where operator supports passing a single condition argument and repeats the behavior of numpy.where() with a single argument by calling dpnp.nonzero()
Also adds bool type support for non_zero functions.

This PR is fixing issue reported in #1242

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[oleksandr-pavlyk]

LGTM from quickly browsing through the code.

[vlad-perevezentsev]

LGTM!
I have checked the change on my laptop and it works great.
Thanks @antonwolfy