IntelPython / dpctl / 6804251458 / 1

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Implements statistical functions ``mean``, ``std``, ``var`` (#1465)

* Resolves gh-1456

Tree reductions now populate destination with the identity when reducing over
zero-size axes. As a result, logic was removed for handling zero-size axes.

``argmax``, ``argmin``, ``max``, and ``min`` still raise an error for
zero-size axes.

Reductions now return a copy when provided an empty axis tuple.

Adds additional supported dtype combinations to ``prod`` and ``sum``, specifically for input integers and inexact output type

* Implements mean, var, and std

* Adds more tests for statistical functions

* Adds docstrings for statistical functions

* Adds more supported types to arithmetic reductions

Permits `float` accumulation type with 64 bit integer and unsigned integer inouts
to prevent unnecessary copies on devices that don't support double precision

* Changes mean reduction to use output data type as sum accumulation type

Mean in-place division now uses the real type for the denominator

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