Query: revisit IsOrdinalKeyProperty

It currently tells us if the given key is ordinal property for this entity, however in case of JSON collection chain, each level adds one ordinal:

owner entity: 1 key property
owned collection root: 1 key property (from owner), 1 ordinal key
owned collection branch: 1 key property (from owner), 2 ordinal keys (one from it's parent and one it's own ordinal key)
owned collection branch: 1 key property from owner, 3 ordinals
and so on

IsOrdinalKeyProperty only detects entity's own key as being ordinal, ignoring the ones inherited from parent.
This is useful info when determining if a given key should be bound or ignored, but maybe we just need a different method for that purpose.