new: add register_next_step_handler for asyncbot

[hiddify-com]

Description

create missing register_next_step_handler in asyncbot using auto state

Describe your tests

run step_example.py in async_telebot

Python version:

OS:

Checklist:

• [*] I added/edited example on new feature/change (if exists)
• [*] My changes won't break backward compatibility
• [*] I made changes both for sync and async

[coder2020official]

No

[hiddify-com]

why?

[coder2020official]

1. Bad implementation
2. No steps in async please

[hiddify-com]

It is based on your recommendation that suggest to use state

It is really useful to have steps in async

The step in sync is buggy also. It does not process middlewares.

[coder2020official]

Steps are an old, somewhat "deprecated"(though not yet and won't probably), so there's no point of improving them when there's a solution(states) which I am currently working on to even further improve

[hiddify-com]

the problem of state is that we can not have more complex workflow for example when we want to get 10 elements from user it is so hard to be implemented by state

[coder2020official]

What do you even mean by "10 elements"? 10 inputs? I am working on an easier solution, some class that will take care of this

[hiddify-com]

yes 10 inputs from the user

great thanks