Changes colocation setup to use only model kwargs. Adds validator, with test

[dulte]

Change Summary

Removes model_read_kwargs from colocation_setup. Now only used model_kwargs. Adds validator for model_kwargs

Related issue number

Fix #1180

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

[dulte]

In the validation of model_kwargs, ValueError can be raised. I did this because it seems that ValidationError can't be raised directly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.25%. Comparing base (5a686b0) to head (a3e5c8d).
Report is 509 commits behind head on main-dev.

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1184   +/-   ##
=========================================
  Coverage     79.24%   79.25%           
=========================================
  Files           129      129           
  Lines         20213    20220    +7     
=========================================
+ Hits          16018    16025    +7     
  Misses         4195     4195           

Flag	Coverage Δ
unittests	79.25% <100.00%> (+<0.01%)	⬆️

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