Investigate splitting expanders package

[lawrencegripper]

It's become large and mixes Utica/helpers, generated and non-gend code.

Is there a nice way to split it up, Make it a bit more approachable?

[github-actions]

Flagging stale issue. Actions will close this issue in the next 5 days unless action is taken.

[lawrencegripper]

I still want to look at tidying this up so marking as no-stale.