docs: add change log entry for #12910

changes/feat-12910.en.md

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+Provided a configuration API endpoint for plugin functionality.
+This allows users to describe the configuration struct of their plugins using AVRO schema.
+During plugin runtime, the plugin's configuration can be accessed via the API.
+
+Added new API endpoints:
+- `/plugins/:name/schema`
+  To get plugins avro schema and i18n config in one json object.
+- `/plugins/:name/config`
+  To get or update plugin's own config
+
+Changed API endpoints:
+- `/plugins/install`
+  Status code when succeeded change to `204`. It was `200` previously.
+- `/plugins/:name/move`
+  Status code when succeeded change to `204`. It was `200` previously.