将 Palm 中文模型接入 MaaS，添加了文本生成 pipeline
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/8934393

    * add text_generation model and pipeline

* fix bug

* fix bug

* add TextGenerator in pipeline

* fix bug

* update checkpoint and test inputs

* remove magic number..

* fix bug

* adjust code with AutoModel

* clear comments and tidy up the code

* move model.eval() into generator

* update master interface and lint code

* replace 'palm-text-generation' with 'palm'

* add text_generation model and pipeline

* fix bug

* fix bug

* add TextGenerator in pipeline

* fix bug

* fix conflict of pipeline.txt

* remove magic number..

* fix bug

* adjust code with AutoModel

* clear comments and tidy up the code

* move model.eval() into generator

* fix conflict

* replace 'palm-text-generation' with 'palm'

* fix conflict

* add test_run_modelhub

* update sofa version

* modify sofa version

* add test_run_with_model_name

* fix bug