adds scm relaxation timescale parameters

[Julians42]

Purpose

Adds 4 parameters to allow SCM to relax to forcing file profile towards forcing file profile (for use in GCM driven and Reanalysis driven cases). These should be changed to switch between shallow and deep convection cases.

To-do

Content

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• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.50%. Comparing base (64914a0) to head (1a1f8cd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #210   +/-   ##
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  Coverage   98.50%   98.50%           
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  Files           2        2           
  Lines         134      134           
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  Hits          132      132           
  Misses          2        2           

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[szy21]

Just a suggestion. For new users end_height may sound like there is no relaxation above that height. Maybe something like maximum_relaxation_height is more clear.