onnxruntime

Add a generic collection of session configurations to the SessionOptions (#4718)

* adding generic configurations for session options

* fix a build break on linux

* fix training ci build break

* fix training ci build break

* addressed CR comments

* fix traning ci build break

* move config_key from enum to string

* add c# api

* add python api

* fix build break

* move prepacking from 2 new api entries to session options configs

* fix traning ci build break

* add python test, update some comments, move const key definition to avoid build break

* addressed comments

* move definitions of keys to common.h

* move api to version 5

* remove accidental change in build.py

* remove pragma to avoid build break

* addressed CR comments

* fix the python build break, and move location of config keys definition

* small typo changes