Type hinting

[manulera]

@BjornFJohansson what we discussed today. Once we have done the big merge, I will do a PR adding type hinting to at least some of the classes. This can be very useful for newcomers, to know exactly what the outputs of functions will be, and get intellisense from IDEs.

[manulera]

@JeffXiePL will also give a go at this @BjornFJohansson.

I have been looking around for libraries to check types dynamically while running the tests. It seems that typeguard would be a good choice, but I found some problems when trying to implement it. I will see if I figure it out, otherwise we can also not check.

[dgruano]

Don't hesitate to use Copilot to help you with this, so far I've had good experiences with it