sage

5f9ac403 -

gh-37258: add type annotations to gens methods This is adding type annotations to many `gens` methods. This will help to make them all return `tuple` later. ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/37258 Reported by: Frédéric Chapoton Reviewer(s): Matthias Köppe