Charging curve on Charging Stats and Charge Details dashboards (#2152)

* Charging curve on grafana dashboards

* charging stats curve add average line

* using median instead of average

* Trace labels

* SuC curve color by age

* Add median power to DC charge curve

Inspired by #2152

* Always use charger_power

* Integrate DC charge curve into Charging Stats

* Change colors

Co-authored-by: Adrian Kumpf <8999358+adriankumpf@users.noreply.github.com>

.gitignore

@@ -55,3 +55,6 @@ config/*.env
 .eclipse/
 .elixir_ls/
 /.project
+
+# Mac files
+.DS_Store