[redux/entities] API path with child path not handled

If I dispatch a path like this, then the `/` will error out my client and not cause it to dispatch.

A schema is expecting the variable name of `order/statistics`. Can we add handling for special characters like this on the schema entities?

```jsx
const mapDispatchToProps = (dispatch, { limit }) => ({
readList: () =>
dispatch(
resourceListReadRequest('orders/statistics', { _limit: limit })
),
})
```