Enhancement: Type Friendly Exports

[tzaffi]

Introduce PyTeal's fix for VsCode type exports issue

This approach was introduced into PyTeal by @barnjamin. I'm just bringing it into this repo.

Former VsCode Pylance error when importing py-algorand-sdk:

Testing

• There is no specific test in C.I. to prove that it works. But it "works on my machine"
• Also introducing python 3.11 into the C.I. workflow

[tzaffi]

bringing these commands into the Makefile

[algochoi]

Explicitly defining __all__ seems like a good practice. Strangely, I don't notice any PyLance errors on my VSCode.

[tzaffi]

@algochoi - please have a look at my latest commit 6e70ed0

I believe that most of your points have been addressed.

[algochoi]

LGTM