Is your feature request related to a problem? Please describe.

I have a long ConversationHandler in which I want all of its handlers to be able to run asynchronously. To achieve this, I have to set every handler in this ConversationHandler with run_async=True. I found this a bit repetitive and thought that there might be an easier way.

Describe the solution you'd like

I think it would be nice if there is an option in ConversationHandler like all_handlers_run_async: bool. When it is set to True, then all the handlers in this ConversationHandler would be overridden with run_async=True.

We can also give a bit more flexibility by adding options like all_entry_points_run_async, all_states_run_async and all_fallbacks_run_async, where it only overrides a subset of handlers with run_async=True

Describe alternatives you've considered

N/A

Additional context

N/A

Let me know what you think and Happy New Year!