implement MIR regridding in FastEval

[iluise]

Describe the task. It can be a feature, documentation, etc.

The new Earthkit geo supports MIR regridding (same as quaver):

https://earthkit-geo.readthedocs.io/en/latest/tutorials/mir_regrid_xarray.html

We should implement it in FastEval for better compatibility with the Quaver scores.

Hedgedoc URL, if you are keeping notes, plots, logs in hedgedoc.

No response

Area

• datasets, data readers, data preparation and transfer
• model
• science
• infrastructure and engineering
• evaluation, export and visualization
• documentation
• performance