* [ONNX] Add eyelike operator

* Use shifted square identity in square identity

* Make new helper function to map onnx_types<->ngraph_types

* Add fp16 support to ngraph Python API

* Move helper common.hpp => common.cpp

* Add checker for attribute presence

* Style check

* Add definition of shifted word

* Change return value of attribute presence !(==) -> !=

* Rename is_attribute_present => has_attribute

* Clean-up headers in eyelike.cpp

* Organize headers in common.*pp

* Minor review fixes

* Style check

* Add test for EyeLike with negative k

* Disable caching when node has state.

* Address PR feedback: move has_state to Node.

* Address PR feedback.

* Fix style error.

* More serialization preparation for iteration ops

* const arg

* const json& leads to memory issues

* Run fused op decomposition recursively until no more fused ops.

* Update callback member name.

* Eliminate wrapped enum
Switch allreduce to new op form

* review comments

* review comments

* typo

* Add provenance tag support

* Added support to clone the provenance tags to the clone nodes

* Style fix

* Addressed comments

* Guarded the provenance code properly

* Added missing header file

* style

* initial implementation of backend config

* check on backend that does not support config

* Use node IDs for comparison when sorting in pattern match.

* Make args const.

* [ONNX] Add support for onnx MeanVarianceNormalization op

* Fix docstring

* Delete commented code

* Add support for legacy onnx MVN version

* Fix a typo in attribute name

* Fix for legacy onnx MVN

* Add a header for int64_t