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Add dynamic shape support to slice operator.

First draft of this feature doesn't support ops slicing non-fixed, dynamic axes. Resulting shape in such cases is not guaranteed.* Also, onnx parsing doesn't support any arguments other than "axes".

* slice+step+reverse: parsing + onnxfile + test

* cleanup

* updates for step operator, abs axis

* test updates

* updates to tests

* slice+reverse verify test

* verify test for slice+step+reverse

* clang format

* reverse with lens

* simplify normalize_compute_shape

* step op: normalization for axes

* clang format

* change of order: fixing wrong functionality in some cases

* test for slice,reverse,step

* clang format
Co-authored-by: Paul Fultz II <pfultz2@yahoo.com>

* refine slice implementation

* clang format

* fix cppcheck error

* clang format

* fix a bug in parsing slice

* add unit tests for slice operator

* clang format

* fix cppcheck error

* add the numpy package in the Dockerfile

* add missing onnx file

* fix cppcheck error

* fix cppcheck error

* add one more unit test related to slice and split

* clang format
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>