fix: use react style event names

[dpilch]

Issue #, if available:
N/A

Description of changes:
Use React style event names. change -> onChange

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[codecov-commenter]

Codecov Report

Merging #445 (8c8ccac) into main (a6c63cb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #445   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files          48       48           
  Lines        1808     1808           
  Branches      394      394           
=======================================
  Hits         1691     1691           
  Misses        113      113           
  Partials        4        4           

Impacted Files	Coverage Δ
...s/codegen-ui-react/lib/react-component-renderer.ts	86.00% <ø> (ø)
...eact/lib/react-component-with-children-renderer.ts	94.44% <ø> (ø)
packages/codegen-ui-react/lib/workflow/events.ts	92.85% <ø> (ø)
packages/codegen-ui-react/lib/workflow/mutation.ts	96.93% <ø> (ø)
packages/codegen-ui/lib/types/events.ts	100.00% <100.00%> (ø)

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