feat(cdn): add versioned artifact endpoints (#7400)

Co-authored-by: Adam Benhassen <adambenhassen@hotmail.com>

Author: n1ru4l

.changeset/two-baboons-tie.md

@@ -0,0 +1,13 @@
+---
+'hive': minor
+---
+
+Add support for retrieving CDN artifacts by version ID.
+
+New CDN endpoints allow fetching schema artifacts for a specific version:
+- `/artifacts/v1/:targetId/version/:versionId/:artifactType`
+- `/artifacts/v1/:targetId/version/:versionId/contracts/:contractName/:artifactType`
+
+Artifacts are now written to both the latest path and a versioned path during schema publish, enabling retrieval of historical versions.
+
+CDN artifact responses now include the `x-hive-schema-version-id` header, providing the version ID of the schema being served.