zod: try out pythonic names

[s-cork]

Just drafting this so I can sleep on the idea but let me know what you think @meatballs

I think, at the moment, I prefer this, since it's closer to python's typing names z.typeddict is a bit verbose but hey... I didn't choose it

I've left the TypeScript names in as aliases for convenience

See #120 for context

[meatballs]

It seems better to match the typing names, even if they're not what we might have chosen

[s-cork]

merci do you think remove the aliases? Or just leave them in and not document them (whenever I get round to that)

[meatballs]

The latter, I reckon

[s-cork]

And should it be typeddict or typed_dict. Same question with notrequired vs not_required. Part of me prefers the no underscore version.

[meatballs]

General convention is to convert camel case to snake, so the underscored option.

[s-cork]

But maybe it can be like namedtuple?

[meatballs]

There's plenty of stuff in the standard lib that was written well before pep8 existed and doesn't conform to it.

I don't think that justifies non-conformance today.

[s-cork]

Ok - names changed - ready I think