Make xstate store and machine api more consistent

[Uniqen]

In order to facilitate the transition between store and machine I would like the select and trigger api from store to be added to the Actor as well.

export interface Store<
  TContext,
  TEvent extends EventObject,
  TEmitted extends EventObject
> extends Subscribable<StoreSnapshot<TContext>>,
    InteropObservable<StoreSnapshot<TContext>>,
    BaseAtom<StoreSnapshot<TContext>> {
...
    trigger: {
        [E in TEvent as E['type'] & string]: IsEmptyObject<DistributiveOmit<E, 'type'>> extends true ? () => void : (eventPayload: DistributiveOmit<E, 'type'>) => void;
    };
    select<TSelected>(selector: Selector<TContext, TSelected>, equalityFn?: (a: TSelected, b: TSelected) => boolean): Selection<TSelected>;
...
}

[Uniqen]

I've made a PR for the select api