Enhancer types are lost when using callback form, and state extensions not reflected

[EskiMojo14]

#2550 made a great start on getting enhancers typed properly!

Unfortunately, the inference still wasn't there when using the callback form, e.g.

const store = configureStore({ reducer: () => 0, enhancers: (defaultEnhancers) => [...defaultEnhancers, myEnhancer] });

The above wouldn't pick up any store extensions.

Additionally, the StoreEnhancer type has a StateExt generic that's not used by RTK - presumably it would make sense for this type to be reflected in the final getState return.