Support Croissant 1.1

[pdurbin]

Croissant 1.1 features (a work in progress) are listed here: New Croissant spec features (view)

We can see the Croissant 1.0 spec here: https://github.com/mlcommons/croissant/blob/main/docs/croissant-spec.md (as of this writing)

We can preview the Croissant 1.1 spec here: https://github.com/mlcommons/croissant/blob/main/docs/croissant-spec-draft.md