Add metadata attribute to kedro.io datasets (#2537)

* Add metadata attribute to kedro.io datasets

Signed-off-by: Ahdra Merali <ahdra.merali@quantumblack.com>
Signed-off-by: Juan Luis Cano Rodríguez <juan_luis_cano@mckinsey.com>

RELEASE.md

@@ -34,7 +34,6 @@
 ## Major features and improvements
 * `kedro run --params` now updates interpolated parameters correctly when using `OmegaConfigLoader`.
 * Added `metadata` attribute to `kedro.io` datasets. This is ignored by Kedro, but may be consumed by users or external plugins.
-* Added `kedro.logging.RichHandler`. This replaces the default `rich.logging.RichHandler` and is more flexible, user can turn off the `rich` traceback if needed.
 
 ## Bug fixes and other changes
 * `OmegaConfigLoader` will return a `dict` instead of `DictConfig`.