Single Table Design Multi Model Store

[hookercookerman]

Is your feature request related to a problem? Please describe.

Single Table Design is the new hotness, at present the stores are limited to one type. I propose a Multi Model
Store, where a key default type key is used for looking up the mappings to apply to that item. This type key (lookup) can be configured as a global config or at the multimodel level for robustness.

The Db Item is not instantiated via its class (which I feel is a good thing) but mappings are applied.

the type key is configurable as a global or at a 'store level`

Describe the solution you'd like

I am happy to tackle this is pointed in the right directions