Fill in gaps in the function metadata storage and traits

[makspll]

Currently we store basic metadata for functions and arguments, but that might not be everything we need for generating documentation etc.

• Derive macro for easier docstring/arg_name registration #264
• feat: refactor core bindings to use new derive macro #267
• feat: refactor generated bindings to use new derive macro #268
• feat: add TypedThrough abstraction to function meta, and refactor #272
• ??

[makspll]

This should be type information to generate something useful