Check model fields on filtering methods of queryset types

[flaeppe]

I noticed that we should check some methods on both Manager and QuerySet since the Manager class is a bit special as it is a type "merged" from BaseManager and QuerySet.

@sobolevn I think this could be a nice addition before releasing 5.0.3, or what do you think?

Thinking that the use cases from the test included here aren't too foreign:

MyModel.objects.filter(id=1).filter(invalid=1)
MyModel.objects.filter(id=1).get(invalid=1)
MyModel.objects.filter(id=1).exclude(invalid=1)
MyModel.objects.filter(id=1).create(invalid=1)

[sobolevn]

Thanks, very good usecase.