[DMN Designer] Boxed Expressions - Decision Tables - Users need to remember to add quotes on "string cells"

As I user, I would like that " would be automatically added to expressions that look like a string, on Decision Tables columns (string typed):

Thus, when the text entry in the cell is not a valid variable in that context neither a valid expression, " s must be added.

⚠️ This issue depends on the FEEL parser running on the client-side.