Expose rule.consequence.promote.objectIDs string array

[aseure]

On top of the existing objectID (singular) string field, a new objectIDs
(plural) string array field is now be exposed in the rule.consequence.promote
Rule object representation. This lets the user easily promote a full group of
objects without letting some priority conflicts to shift some objects at the end
of the promoted object list.

[nunomaduro]

This is a non-typed API Client. Therefore, nothing to perform here.