gh-92203: Add closure support to exec(). (#92204)

gh-92203: Add closure support to exec(). (#92204)

Add a closure keyword-only parameter to exec(). It can only be specified when exec-ing a code object that uses free variables. When specified, it must be a tuple, with exactly the number of cell variables referenced by the code object. closure has a default value of None, and it must be None if the code object doesn't refer to any free variables.