Improve python bindings to return objects where appropriate

[wxsBSD]

I haven't looked into what this would take yet but I happened to notice that compiler errors and warnings are returned as a list of dicts, which seems like a step back from the OG yara bindings where we were returning objects for these things. Is there a desire to keep things the way they are or are you interested in converting these to actual objects so we can have some more structure around them (and ideally better type hints)?

I'm more than happy to do the work but it would break any users of the existing API (again, I'm fine with that as we haven't declared anything stable that I'm aware of). Thoughts on this?