HOB: withSubscription

[christoph-fricke]

Makes it less verbose to subscribe an actor that is spawned from a behavior to a publisher.
The subscription is handled automatically by the life-cycle of the behavior.

Instead of manually subscribing and unsubscribing the spawned actor, its behavior can simply be wrapped in withSubscription.

const behavior: Behavior/* ... */;
const publisher: ActorRef/* ... */;

const wrapped = withSubscription(behavior, publisher, ["publish-matches"]);
const actor = spawnBehavior(wrapped);