sage

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gh-37187: implement E_polynomial of hypergeometric motive This is adding a new method tp hypergeometric motives. ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. - [ ] I have linked a relevant issue or discussion. - [x] I have created tests covering the changes. - [x] I have updated the documentation accordingly. URL: https://github.com/sagemath/sage/pull/37187 Reported by: Frédéric Chapoton Reviewer(s):