Try to re-think the visitsAsyncThunk, so that it wraps all the action creators in the same object

[acelaya]

Right now, the createVisitsAsyncThunk helper, does not really return an async thunk. Instead it returns an object wrapping the async thunk + the three extra actions to reset, fallback and large-load.

Ideally, it should return a regular async thunk that has been enhanced with the three extra actions, which also allows for a type-safe usage on the extra reducers.builder.addCase of any redux slice.