为diffusion模型加入dpm solver支持，相比ddim scheduler快2～6倍。
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10826722

unittest for demo service
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10006180

出于可能法务风险，将复现的Google 「Imagen」算法重命名为「diffusion」。
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9608897

co-contributed with 夕陌&雨泓

 * add torch epoch based trainer and dis utils
 * add hooks including optimizer, lrscheduler, logging, checkpoint, evaluation, time profiling
 * add torch mdoel base and test
 * add optimizer and lrscheduler module
 * add sbert for text classification example
 * add task_dataset for dataset-level processor

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9338412

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9268865

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9242667