1. refactor maaslib to modelscope 2. fix UT error 3. support pipeline which does not register default model Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/8988388
Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/8819462
* add license * add folder structure Link: https://code.aone.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/8682838