Add changelog entry

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

Author: 5 people

ouroboros-consensus/changelog.d/20250916_104805_thomas.bagrel_basic_peras_types.md

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+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+### Breaking
+
+- Introduce `Ouroboros.Consensus.Block.SupportsPeras` with types related to Peras.
+  - All new types are re-exported through `Ouroboros.Consensus.Block`.
+- Introduce `Ouroboros.Consensus.Peras.Weight` with weight computation related types and functions for chains and fragments.
+- Introduce a new benchmark suite `PerasCertDB-bench`
+- Add property tests and benchmarks for weight computation on chain and fragments