Add registration to plugin categories

[jni]

Closes #317

[jni]

@DragaDoncila? 🙏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2b5f7b2) to head (5430fd0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #355   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        37           
  Lines         2758      2759    +1     
=========================================
+ Hits          2758      2759    +1     

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[DragaDoncila]

Yep, I think Registration is definitely fair to include, especially as we now have a menu for it yay! I don't think this is sufficiently controversial to warrant a waiting period, so I'm going to merge.