[enhancement]: workflow json fields should be in stable order

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What should this feature add?

When I save my workflows to file, I'd like to avoid the extraneous diff noise that comes from the fields moving around. i.e. "version" might come first once, but "type" on a later re-save.

There should be some sort of canonical order to these, whether that's alphabetical or the order of the pydantic fields or whatever.

[[example workflow diff](https://gitlab.com/keturn/chroma_invoke/-/merge_requests/3/diffs?commit_id=da4b3c686daeb71d95a41fbc1f68186e0648f7c1)]