ORTOptimizer refactor (#457)
* ORTOptimizer refactor
* Add AutoOptimizationConfig
* Update the tests
* Use NormalizedConfig
* Add top file comment
* Update tests
* Update names
* Apply suggestions
* Add documentation
* Update optimum/onnxruntime/configuration.py
Co-authored-by: regisss <15324346+regisss@users.noreply.github.com>
* Add O4 optimization level
* Style
* Fixed flaky test
Co-authored-by: regisss <15324346+regisss@users.noreply.github.com>
