add ifs model to list

[charlienegri]

Change Summary

we will start evaluating some IFS data too and a new model entry is needed
the data will be placed in the same location as and with a format indistinguishable from the current cams2_83 model data so this is the only change required on the pyaerocom side

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.35%. Comparing base (975e047) to head (413f9b8).
Report is 3 commits behind head on main-dev.

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1420   +/-   ##
=========================================
  Coverage     78.35%   78.35%           
=========================================
  Files           137      137           
  Lines         20888    20889    +1     
=========================================
+ Hits          16366    16367    +1     
  Misses         4522     4522           

Flag	Coverage Δ
unittests	78.35% <100.00%> (+<0.01%)	⬆️

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