添加QWen 7b base模型和chat模型及相关pipelines
Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/13482235
* add qwen 7b base and chat
* fix logger
* update examples, lint test
* add unittest for qwen base and chat
* rename qwen to qwen-7b
* resolve imports and add a registry to text-generation
* reset load model from pretrained
* fix precheck
* skip qwen test case now
* remove strange file