add various type hints

[lockenkop]

Some of them may be debated upon. Most of the changes are return hints

[infeeeee]

Can you fix the tests? I think you just have to add from __future__ import annotations at the top of some files, usually that's all.

Run the tests locally, you can find which file is the problem exactly: https://github.com/richibrics/IoTuring/blob/main/docs/DEVELOPMENT.md#tests Run it in docker so you can use the same python version.

[lockenkop]

That's what I get for doing this quickly on my train ride. I need to stop using `git add .` Sorry for that.

[infeeeee]

Nice. Other things to do:

• There is also a predefined choice list in Terminal entity, please upgrade that to TypedDict as well
• I just searched for Callback and I still found some methods in some entities where MQTTMessage could be hinted