Export types correctly in wildcards

[AndyTitu]

Summary

This PR fixes the Item types not being exported correctly.

Thought process

The problem occurred because of the logic for filling up the __all__ field in init.py. Fixed this by evaluating the types module and extracting the right types from it.

How to test

1. pip install . - to install the current version

2. python3 example/example.py to run the example.py file

[hculea]

Functionally tested - confirmed that this change translates in the statement

from onepassword import *

also importing the types.

I'm not aware whether this is the idiomatic way to do this in Python, though, but feel free to proceed only with my review if you're confident about it.

[AndyTitu]

Functionally tested - confirmed that this change translates in the statement

from onepassword import *

also importing the types.

I'm not aware whether this is the idiomatic way to do this in Python, though, but feel free to proceed only with my review if you're confident about it.

Yes, I'm confident. Wildcards are used sometimes, and it's important to support those as well in addition to all other importing syntax we already support such as from onepassword import Client, Item or from onepassword.types import Item or from onepassword.types import *.