Created by: chuanqi129

This PR aims to enhance calibration tool to support more INT8 ops as the reference of INT8 v2. Details are below: • Refactor the code with improved algorithm to modularize the basic functionalities, e.g., inserting quantize and dequantize op. • Support more INT8 ops, e.g., concat, transpose/transpose2, reshape/reshape2; add the scale unification for concat as well. Please help to review it. Thanks.