Simplified session code

[bug-or-feature]

I'd like to simplify the session code, its way too complicated (I think).

Does anyone use the CachedSession stuff? I'd like to remove it completely.

[galburn]

I'm doing my own caching in Redis, so not using CachedSession.

[wookiesh]

Hello, yes I do, creating the session at IGservice level.
I handle some more caching using MongoDB (telethon etc) but as it is backed in, that's nice.