"Development model output" mode?

It would be great to run REF (locally) for development model runs, for which the output may not (yet) be fully compliant with the CMIP6 CMOR standards, or include all the necessary metadata.

I attempted to ingest CMIP7 CMORized output for a development model run, but ran into an issue with the mandatory requirement for `licence_id` in the `cmip7_parsers` (https://github.com/Climate-REF/climate-ref/blob/main/packages/climate-ref/src/climate_ref/datasets/cmip7_parsers.py#L165).
While I could get around this by removing the mandatory requirement, I wonder if there's been a "development model output" mode of the REF that I should be using?
I expect I'll also run into issues with the constraints of the diagnostics (e.g., timeranges).

I'll try to add to this issue other issues I run into as I attempt to work with development models.