add system settings

[isc-etamarch]

Fixes #535

@isc-tleavitt Let me know if settings should be added / removed from the ones saved

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.84%. Comparing base (4c5dfee) to head (bbb13b3).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #634   +/-   ##
=======================================
  Coverage   41.84%   41.84%           
=======================================
  Files          22       22           
  Lines        3016     3016           
=======================================
  Hits         1262     1262           
  Misses       1754     1754           

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[isc-tleavitt]

Note: from a SemVer perspective, "Added" means we're going from a patch (bugfix) release to a minor release, so the changelog and module.xml should update to 2.8.0 accordingly.

[isc-tleavitt]

One more nit, let's put Added before Fixed in the changelog, should have said that before.

I'm going to hold this in Approved until we decide if we're going to do a bugfix release prior to releasing Production Decomposition.