Why do `SpCodeInteractionModel>>#bindings` return an empty dictionary ?

[adri09070]

Right now, except SpScriptingInteractionModel (i.e: playground), no interaction model can add bindings for variables.

This is very rigid and I don't think this is good as some external tools may want to add variables in an inspector (SpCodeObjectInteractionModel) or maybe elsewhere.

This is literaly the principle of Chest for example, to be able to access your objects from anywhere in the image: https://github.com/pharo-spec/Chest