[Breaking] Rename RTKQ `RootState` type

[markerikson]

Per reduxjs/redux#4706 , having that RootState type exported makes it possible for an editor to accidentally import it instead of an application's self-defined RootState type.

[median-dxz]

Just a small reminder: the release title on GitHub related to this update is 2.2.6. Please take a moment to update it when you have the chance.
Thanks to you and arya heavily work for this update.

[EskiMojo14]

@median-dxz fixed, thanks