Setup Paparazzi for composable screenshot tests

[frett]

Paparazzi provides us the ability to validate UIs against golden values to detect when a UI changes due to a change we make.

This will hopefully provide stability for our UIs as we update underlying data models and rendering logic.
Also, when we make an intentional change to a UI component, it should be possible to preview the actual UI differences during code review.

[codecov]

Codecov Report

Attention: Patch coverage is 59.09091% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 37.18%. Comparing base (077825f) to head (c451908).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
.../cru/godtools/base/ui/compose/CompositionLocals.kt	0.00%	4 Missing ⚠️
.../downloadable/LanguageDownloadProgressIndicator.kt	81.25%	1 Missing and 2 partials ⚠️
...in/org/cru/godtools/base/ui/theme/GodToolsTheme.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3407      +/-   ##
===========================================
+ Coverage    36.90%   37.18%   +0.28%     
===========================================
  Files          446      446              
  Lines        10850    10857       +7     
  Branches      2465     2467       +2     
===========================================
+ Hits          4004     4037      +33     
+ Misses        6130     6095      -35     
- Partials       716      725       +9     

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[frett]

@aaronlaib this might be of interest to you and Jill, you can see screenshots of the various UI elements that paparazzi is tracking here.