📝 Add docstrings to `Feature/config_check`

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Docstrings generation was requested by @vstars1.

• https://github.com/mimo-x/Code-Review-GPT-Gitlab/pull/15#issuecomment-2677388429

The following files were modified:

• gitlab_integration/gitlab_fetcher.py
• gitlab_integration/webhook_listener.py
• response_module/abstract_response.py
• response_module/response_controller.py
• response_module/response_factory.py
• response_module/response_target/msg_response/dingtalk_response.py
• response_module/response_target/msg_response/gitlab_response.py
• response_module/response_target/other_type_response/template_response.py
• review_engine/abstract_handler.py
• review_engine/handler/default_handler.py
• review_engine/review_engine.py
• utils/args_check.py
• utils/gitlab_parser.py
• utils/tools.py

These file types are not supported

• README.md
• doc/response.md
• doc/review.md

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