extend the H4R's createStore to accept a reducer function as the first argument

[shanebdavis]

The goal here is to allow people to incrementally convert an existing Redux project to H4R. To start, someone would just replace the Redux createStore with the H4R createStore. In order to do this, H4R's createStore needs to support the same API as Redux (it doesn't currently).

After solely replacing Redux's createStore with H4Rs, the rest of the project should still run and work unchanged. From there, the people doing the migration could incrementally either add createReduxModule calls for new slices or start replacing existing Redux state with createReduxModule.

Support this pattern:

import { setStore, createStore } from "hooks-for-redux";

export default setStore(createStore((state) => state));

[shanebdavis]

Note, we should not break backward compatibility.

[shanebdavis]

The focus is to make createStore compatible with Redux’s createStore API. It should also be backward compatible with H4R’s api. I think both are possible.