Bias correction

[maxnoe]

Is bias correction something wanted in pyirf?

If so, where should it be implemented?
Directly as an option in the resolution functions?
Or as separate functions?

Originally posted by @vuillaut in #184

[HealthyPear]

I think we could generalise this option in a similar way to what we did for resolution:

• a module or a section of it for bias correction methods (or applied to specific cases, like energy)
• the resolution function calls a keyword argument which sets which function to use

Regarding specifically what CTAMARS does see here.
This happens after cuts optimisation, so in that case it fits with pyirf's scope.