Add changelog snippet for RIA update

changelog.d/20240514_212532_michael.hanke_patch_create_sibling_ria.md

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+### 💫 Enhancements and new features
+
+- A large 3k-line patch set replaces almost the entire RIA implementation,
+  including the ORA special remote, and the `create-sibling-ria` command.
+  The new implementation brings uniform support for Windows clients, progress
+  reporting for uploads and downloads via SSH, and a faster and more
+  robust behavior for SSH-based operations (based on the new remote
+  shell feature).
+  Fixes https://github.com/datalad/datalad-next/issues/654 via
+  https://github.com/datalad/datalad-next/pull/669 (by @christian-monch)