Update listener internal slots to map<name, structure>

[zolkis]

Currently internal slots for [[readHandlers]], [[writeHandlers]], etc. are a map from name to a handler function.

Besides that function, the steps require saving |options| and other information as well. So the internal slots will need to contain an object like

dictionary HandlerData {
    required function handler;
    sequence<InteractionOptions> subscriberOptions;
    sequence<any> subscriberData;
}

We could also add the |interaction| for convenience, but it can me retrieved using |name|.

[relu91]

Call 24/04/2023:

• It is an improvement, but let's postpone it after publication.

[relu91]

Call 15/05/2023

• @zolkis @relu91 we'll check if the new version contains the proposed structure for [[readHandlers]]

[relu91]

I can confirm that the current structure of the internal slot [[readHandlers]] is not the same as described above. My question is do we have evidence requiring the data contained in the updated dictionary?