Request: Add Python type hinting to pyslang

[parker-research]

Pyslang does not currently appear to be configured/set up to support strong typing at all, making it a bit difficult to use with modern IDEs (which can help suggest whether a method actually exists, etc.).

It would drastically increase the usability of this library if the typing information (which is presumably strong in C++'s type system) was transferred to pyslang.

[MikePopoloski]

I agree that this is nice to have but it's not something I have time to spend on any time soon. I'd be happy to accept a PR though if you want to tackle it.