* Checking if provenance_tags key exists

* Add provenance tag prototype

* Format provenance tag

* Display provenance tag

* Clean debug printing

* Add const to variables

* Separate method for add provenance tags

* Return NodeVector reference

* Return const NodeVector

* Moved add_provenance_tags function to commons

* Style apply

* Simple model for tests

* Provenance tag test

* Expect substring instead of  equal

* Add provenance tags to intermediate nodes recursively

* One tag per node

* Add traverse node args instead of recursion

* Return NodeVector instead of set of pointers

* Use treverse_nodes and lambda function

* Remove unused helper functions

* Remove is_constant() condition

* Update test model prototxt

* Update test substring

* Use node name and output names to build provenance tags in onnx importer

* Unit tests for onnx_importer provenance tags

* Missing <numeric> include

* Add provenance tags to constants buit from ONNX initializers

* Add provenance tags to Constants and Parameters created out of ONNX inputs and initializers

* More strict assertions in onnx provenance tests

* Unit test for onnx importer Parameter nodes tagging

* Helper function for the onnx provenance tests

* Some docs

* Obsolete comment removal

* Separate file for onnx provenance tags unit tests

* Code formatting

* Move the inputs tagging to the Graph class

* Tagging moved to the Graph class entirely

* Missing include and extra helper variable

* Unit tests helper documentation

* Change the UT helper to lowercase
Co-authored-by: Katarzyna Mitrus <katarzyna.mitrus@intel.com>