* Utility functions for calculating Lp norm.

* Use functor object as a reduction operation.

* Use new api of make_ng_reduction_op.

* Use utility norm functions for reduction operations.

* Onnx GlobalLpPool operator.

* Ensure correct shapes after lp_norm reduction.

* Remove unused function overload.

* Fix shapes and tensor types.

* Unit tests.

* Update comments.

* Update supported ops status table.

* Fix: take absolute value of input tensor elements.

* UT: with odd value p-norm.

* Fix: move taking abs value into respective lp-norm functions.

* Fix clang -Wdocumentation-unknown-command error.

* Update supported op status table with new Jira ticket for Erf op.

* Update supported_ops status table.

* Update interface of make_ng_reduction_op - accept std::function object.

* Update to use new make_ng_reduction_op api.

* Remove unused header.

* Fix errors on CentOS.