feat(config): Add optional 'description' field to Chain input (#57)

[chodec]

Summary
Adds the optional description: str | None field to the Chain model for input JSON queries (query format).

Changes
Added the optional description parameter to the Chain class in openfold3/projects/of3_all_atom/config/inference_query_format.py.
Per the discussion in the Issue, this field is intended solely for input organization and is not propagated to output files.

Related Issues
Closes #57

Testing

• Automated Tests: Automated tests could not be run due to DeepSpeed/CUDA import errors in the local environment.
• Manual Verification: Manual verification of the Pydantic model syntax confirmed that the model successfully accepts JSON input including the new field without raising a validation error.

Other Notes
Thank you for the opportunity to contribute!

[jnwei]

@chodec, Thank you for making this PR, much appreciated.

The changes look good. Do you mind also adding the new description field to the documentation here?

Something to the effect of

  - `description` *(str | None, optional)*
    - Optional metadata to provide for each chain

[chodec]

Hey @jnwei, thanks.
Yea, I'll add it right after I come back from work.

[chodec]

@jnwei next time I'll be aware of updating also docs.
Looking forward to seeing this merged.

[jnwei]

Thank you for adding this feature @chodec !

[lucajovine]

Thanks a lot from me too @chodec and @jnwei!

[chodec]

@lucajovine @jnwei no worries, if you have any similar issues to solve feel free to message me.
thanks

[lucajovine]

Well, since you ask — I'd love to see suggestion #58 implemented :-)