Dev check middleware to warn about action creators being dispatched

[EskiMojo14]

A semi-common mistake is to dispatch an action creator without calling it first, e.g. dispatch(actionCreator).

This doesn't currently raise any errors:

• In Typescript, RTK's action creators having a static type property mean they conform to the Action type.
• In runtime, dispatching a function is usually picked up by the thunk middleware, which would end up returning actionCreator(dispatch, getState, extra).
  An error would only be raised with no thunk middleware.

From a Typescript perspective, this would likely only be solveable by adding some sort of [notAnAction)?: never property to the base Action type, and adding a [notAnAction]: true property to the action creators, making it incompatible. (this also wouldn't prevent action creators without parameters being valid thunks, unless something similar was done for ThunkAction)

From a runtime perspective, this could be fairly simple: a dev-only middleware similar to the serializability and immutable middlewares looks for a unique property we assign to RTK action creators, and warns in console if it sees one.