Expose entityId as a property for "ha-more-info-dialog"

[ildar170975]

The ha-more-info-dialog element has a property entityId:

But it is not exposed (like __large):

Something like this is probably needed:

  @state() private _entityId?: string | null;
          --->
  @property({ type: string, reflect: true }) public _entityId = null;

What for?
Accessing an entityId will allow users to customize more-info in an external js - dependently on an entity.
A possible example: always show "large" more-info for sensor entities to get wide graphs by default.