types: add some types to generateCategoricalChart

[ckifer]

Description

silly PR with a few type additions in the generate function

Related Issue

Motivation and Context

I can't do anything else helpful!

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have added a storybook story or extended an existing story to show my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.56%. Comparing base (85b29df) to head (002217b).

Additional details and impacted files

@@           Coverage Diff           @@
##              3.x    #4535   +/-   ##
=======================================
  Coverage   95.55%   95.56%           
=======================================
  Files         116      116           
  Lines       22220    22230   +10     
  Branches     3057     3057           
=======================================
+ Hits        21233    21243   +10     
  Misses        981      981           
  Partials        6        6           

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