Case C-3/19: Judgment of the Court (Second Chamber) of 4 June 2020 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Asmel societá consortile a r.l. v A.N.A.C. — Autorità Nazionale Anticorruzione (Reference for a preliminary ruling — Public procurement — Directive 2004/18/EC — Central purchasing bodies — Small municipalities — Restriction to only two organisational models for the central purchasing bodies — Prohibition of use of a central purchasing body under private law and with the participation of private entities — Territorial restriction of the activity of central purchasing bodies)