onnxruntime

make (de)tensorization events measure level events (#4958)

* make tensorizer events measures

* throttle the events and add a new one SoftwareBitmapToGPUTensorTelemetryEvent

* factor out timing code into a class

* typo

* typo

* move eventimer class into its own header file

* add throttling to detensorization and remove variable timing

* make detensorization events measures as well

* add ConvertGPUTensorToSoftwareBitmapTelemetryEvent event

* de-duplicate event names

* fix comment

* PR feedback