Updating Associated Metadata Provider to follow the existing pattern.

cc @dougbu @rynowak 
binding, model binding, and binder relate to the same concept and shouldn't be repeated in these names.  in addition "binding info for the property" can be shortened to "property binding info" or "binding property info" since "property info" is information about the property.  could use "Descriptor" as in `BinderPropertyDescriptor` if you want to avoid referencing the existing `PropertyInfo` type.