Issue #2030633 by hussainweb, Mile23, carsonevans, czigor, Berdir, fernando_calsa, Geijutsuka, amitgoyal, Jānis Bebrītis, undertext: Expand FieldStorageConfig with methods

Issue #1823494 by Berdir, sun, Jānis Bebrītis: Field API assumes serial/integer entity IDs, but the entity system does not.