add the config of orientation model
add the preprocess op RandomRot90 that can rotate the img and return the orientation
add the CustomLabelDataset that support getting label by preprocess
refactor some preprocess ops to support dict parameter and return dict

add shitu pipeline evaluation

Add flexible configuration of PP-ShiTu detection model

Add shitu android demo2

the ips is unstable in the first 50 iter when training lite modle.

update table_attribute demo imags

fix shitu scenarios doc

fix bugs to adapt to the new framework

add table_attribute docs

update pp-shituv2 doc

fix Constant learning rate bug