Add changelog entry

Co-authored-by: Nicolas BACQUEY <[email protected]>
Co-authored-by: Thomas BAGREL <[email protected]>
Co-authored-by: Agustin Mista <[email protected]>

Author: 3 people

ouroboros-consensus/changelog.d/20251224_142406_agustin.mista_vote_db.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+### Non-Breaking
+
+- Add Peras vote aggregation logic.
+- Add PerasVoteDB API and in-memory implementation.
+- Add ObjectDiffusion instances for Peras votes using the PerasVotedDB as backend.
+
+<!--
+### Breaking
+
+- A bullet item for the Breaking category.
+
+-->