onnxruntime

attention fusion kernel refactoring (#8432)

* attention fusion kernel refactored

* consider the case of none in add_qk

* variabled added to check for pre-pack weights

* added a comment to PrePack()

* Optimized prepack and try to free the weights

* making comment sound better

* fixing a bug with optimizer.py

* commented out changes to be done

* removed comments

* make the private fn() private

* fix build

* making clean up fn static

* backed out optimizer tool change, needs more looking into