bpo-34939: Allow annotated global names in module namespace (GH-9844)

bpo-34939: Allow annotated global names in module namespace (GH-9844)

Allow annotated global names in the module namespace after the symbol is
declared as global. Previously, only symbols annotated before they are declared
as global (i.e. inside a function) were allowed. This change allows symbols to be
declared as global before the annotation happens in the global scope.