XYChart series components do not export Prop types

[hellosmithy]

It's difficult to wrap / extend the XYChart series components in TypeScript because they don't expose explicit exports of their prop types (which are generic).

E.g. https://github.com/airbnb/visx/blob/master/packages/visx-xychart/src/components/series/LineSeries.tsx

It's possible to extract the prop types using something like:
React.ComponentProps<typeof LineSeries> but they lose their generic properties due to the use of typeof.

Since other components do expose their props as exports, can we add the same for the series components?
I'm happy to raise a PR for this change.

[williaster]

Hey @hellosmithy 👋 , I 100% agree this is a pain point and ideally the types would be exported. I don't have the bandwidth to do this right now but would happily review a PR 🙏