Add local storage item removal option to usePersistedState

[korolainenriikka]

usePersistedState hook does not currently support removing an item. One option would be to remove the key if value given is null or undefined:

import { isNil } from 'lodash';

if (isNil(value)) {
    storage.remove(key);
} else {
    storage.set(key, value as any);
}
          
if (options?.urlKey) setUrlState(options?.urlKey, value as any);

...but this would not allow explicitly setting any key to null / undefined. Initially this feels like a good constraint, but there might be some case some day where explicit setting to null / undefined would be desirable, so not sure if this is the best solution.