Bpx-py

Remove hardcode test and enum

More comments.

Typing more functions.

Constants and models added.

Functions are now commentated.

**Black** code style.

Fixed types in all functions in old style.

**Simulations** are removed for development.

Refactored

Changes:

`__async` module is `async_` now

`__from` variable is `from_` now

Changes according to this changelogs:
https://docs.backpack.exchange/#section/Changelog/2024-05-01
https://docs.backpack.exchange/#section/Changelog/2024-05-02