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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

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

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