Case C-237/21: Judgment of the Court (Grand Chamber) of 22 December 2022 (request for a preliminary ruling from the Oberlandesgericht München — Germany) — Proceedings relating to the extradition of S.M. (Reference for a preliminary ruling — Citizenship of the European Union — Articles 18 and 21 TFEU — Request sent to a Member State by a third State for the extradition of a Union citizen who is a national of another Member State and who has exercised his right to free movement in the first of those Member States — Request made for the purpose of enforcing a custodial sentence — Prohibition on extradition applied solely to own nationals — Restriction of freedom of movement — Justification based on the prevention of impunity — Proportionality)