fix(combineSlices): Infer PreloadedState properly from provided slice

[EskiMojo14]

Currently combineSlices does not account for reducers that can receive different state than they return.

The most common example of this would be a reducer that's been through persistReducer, as they can receive an object without the _persist key, but will always return one. combineSlices' current types only care about what's returned, so will always require that _persist key to be passed as part of preloadedState.

declare const baseReducer: Reducer<{ foo: boolean }>

const persistedReducer = persistReducer(baseReducer)

const rootReducer = combineSlices({ bar: persistedReducer });

rootReducer({ bar: { foo: true } }, { type: "" }) // should be allowed, but errors saying _persist is missing

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