Make the setup new codes widget part of the code selection widget optional

[edan-bainglass]

This PR provides a backwards compatible path to make the new code setup widget part of the code selection widget optional.

The PR also adds a flag (true by default) to control if the codes should be pre-fetched. This is useful, for example, in the QE app, where the MVC redesign (#802) provides these codes via models, removing the responsibility from the UI widgets.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.46%. Comparing base (2677368) to head (491b483).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #646      +/-   ##
==========================================
+ Coverage   83.43%   83.46%   +0.02%     
==========================================
  Files          17       17              
  Lines        3550     3556       +6     
==========================================
+ Hits         2962     2968       +6     
  Misses        588      588              

Flag	Coverage Δ
python-3.11	83.46% <100.00%> (+0.02%)	⬆️
python-3.9	83.50% <100.00%> (+0.02%)	⬆️

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[superstar54]

Thanks for the work!
Could you also add a test on the new optional parameters?

[danielhollas]

I've had only a very brief look and don't see anything unreasonable, thanks!

[superstar54]

Thanks for adding the tests!