[Bug]: cwl_utils input source bug when using 'save'

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### Bug Description

After noticing a weird behavior with the [save](https://github.com/common-workflow-language/cwl-utils/blob/main/cwl_utils/parser/__init__.py#L410) function from `cwl_utils` I opened an issue: https://github.com/common-workflow-language/cwl-utils/issues/402

To make sure we avoid this, we should follow a convention where step names follow kebab case and inputs snake case, what do you think?

### Steps to Reproduce

See issue.

### Expected Behavior

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### Actual Behavior

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### Environment

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### Relevant Log Output

```shell

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### Additional Context

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