* [ONNX] Hardmax implementation in the onnx importer

* [ONNX] More generic handling of types in hardmax

* [ONNX] Support for doubles in EmbeddingLookup CPU builder

* [ONNX] Throw when the provided axis is out of range

* [ONNX] Skip the hardmax test on GPU

* Unused headers clean-up

* refactor: move the identity matrix generator to common.hpp

* ASSERT_VALID_ARGUMENT for axis range validation

* Adapt to the code changes in master