Introduce a new method for checking whether session_store is set by user or by Rails

- We need to ability to check whether the session store it is set or
   not so that we can set it ourselves in an internal initializer.
- We can't rely on return value of `config.session_store` as it can
  return `nil` when set to `disabled` and we will accidentally override it
  and set to default cookie store.
- So introduced new method which just tells us whether it is set or not.

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