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Fixes the false positive reported in https://github.com/github/codeql/issues/18910 Adds a new `Annotation` class (subclass of `Expr`) which encompasses all possible kinds of annotations in Python. Using this, we look for string literals which are part of an annotation, and which have the same content as the name of a (potentially) unused global variable, and in that case we do not produce an alert. In future, we may want to support inspecting such string literals more deeply (e.g. to support stuff like "list[unused_var]"), but I think for now this level of support is sufficient.