[RFC] Draft of validation utilites - focusing on type checking

[klecki]

Signed-off-by: Krzysztof Lecki klecki@nvidia.com<!---
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Category: New feature

Description:

In error_reporting.h set of overloads for checking type of inputs, outputs, arguments and the dtype is provided.
Usage is applied to selected operator.
Possible extension of validation tools is explained, but it seems that this approach may be a little bit too constraining and verbose at the same time.

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DALI team only

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