useSafeLocalStorage should have an option to saveInLocalStorageOnInitializeIfNotExist

[peterHakio]

When having multiple useSafeLocalStorage dependent on the same useLocalStorage and there is no value acturally set in local storage, then all of the useSafeLocalStorage will return their default value, which might be different. In order to solve this I want an option to set saveInLocalStorageOnInitializeIfNotExist = true. Which makes sure that the initial value is saved in localStorage and therefore populated to all the users of the useLocalStorage, ensuring consistentcy.