move .info from MapperProperty down to _InspectionAttr

[Mike Bayer]

this will give us an .info collection on all ORM attributes including hybrids and assocaition proxies, and also on mapper/aliasedinsp, e.g. when you say inspect(SomeClass), which might be useful.

[Mike Bayer]

0.9 has gone too far, 1.0'ing this

[Mike Bayer]

• The :meth:.InspectionAttr.info collection is now moved down to :class:.InspectionAttr, where in addition to being available on all :class:.MapperProperty objects, it is also now available on hybrid properties, association proxies, when accessed via :attr:.Mapper.all_orm_descriptors. fixes #2971

→ <<cset ea85c7053dc9>>