Avoid the need to manually create the `SidebarStore` type by inferring
it automatically. This works as follows:

 1. The `modules` argument to `createStore` has been converted to a
    tuple type (`[ModuleA, ModuleB, ...]`)
 2. The type of a module that would result from merging all the
    individual modules (`ModuleA & ModuleB ...`) is computed
    using a `TupleToIntersection` utility type
 3. `StoreFromModule` is used to compute the type of the store that the
    merged module would produce