[workflow]New version: Create workflow files for examples' auto check

[ziyuhuang123]

1. Add several .github/workflows/yml file to implement auto check function on example files.

• While a new PR is submitted, if the example folder has been changed, the corresponding sub-folder will run automatically to check whether using the latest colossalai it works correctly.
• Every Sunday's 00:00 (Singapore time) will run all the sub-folders in example folder to check whether the latest colossalai's APIs work well on them.
• One can manually assert several sub-folders of example folder to run the code using the manual_check_example_file in example_dispatch.yml file.

2. Changed several small bugs in /example/language/gpt folder. Basically the parameter initializing, requirement setting and so on.