feat: add custom summarizer argument in CLI run mode 在CLI启动模式中添加自定义Summarizer参数

[so2liu]

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Motivation

The new CLI mode is very helpful. But it's lack of custom summarizer argument. This PR solves this. User can use python run.py --models hf_qwen_7b --datasets smoking_gen --summarizer configs/summarizers/medium.py to run with custom summarizer.

Modification

1. Add --summarizer argument
2. read related config file
3. fix related bug to compatible with command without custom summarizer

Use cases

The following cases are tested. smoking_gen is a short custom defined dataset to test quickly.

• python run.py --models hf_qwen_7b --datasets smoking_gen --summarizer configs/summarizers/medium.py
• python run.py --models hf_qwen_7b --datasets smoking_gen

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[gaotongxiao]

Thanks!