docs: update release notes

Signed-off-by: Mohammad Tayyab <Mohammad.Tayyab@neustrom.de>

Author: Mohammad-Tayyab-Frequenz

RELEASE_NOTES.md

@@ -7,6 +7,17 @@
 ## Upgrading
 
 <!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+- Adds active energy consumed and delivered data accessors to `MicrogridData`, plus a new helper to fetch
+metrics for the component types present in a microgrid configuration.
+
+## Upgrading
+
+- `MicrogridData`
+  - adds `ac_active_energy_consumed()`, `ac_active_energy_delivered()`, `metric_with_present_component_types()` to fetch:
+    - `ac_active_power`
+    - `energy_consumed`
+    - `energy_delivered`
+    - net `ac_active_energy` (`consumed - delivered`)
 
 ## New Features