Improve quantization tools:
1. Support QAT
2. Make quantization tool to register Operators.
3. Make the API clear to use
Co-authored-by: t-yguo <t-yguo@microsoft.com>
* improve calibration tool
* modify calibration interface name
* modify calibration interface name
* refine calibrate and calibrate_user
* refine and add type info
* refine and add type info
* add e2e user example file
* remove unnecessary files
* remote test images no longer needed
* update readme document
Co-authored-by: t-yguo <t-yguo@microsoft.com>
* add calibration tool
* add model for e2e example
* format readme
* some more formatting updates
* plus a few more updates
* plus review comments
* plus updates
* more updates