Add nwp_interval_minutes to multimodal.yaml

Update example configs to accommodate setting different time resolution for NWPs

configs.example/model/multimodal.yaml

@@ -89,6 +89,10 @@ nwp_history_minutes:
 nwp_forecast_minutes:
   ukv: 480
   ecmwf: 480
+# This dictionary is optional, but make sure to include if using data with different time resolution as defaults to 60  
+nwp_interval_minutes:
+  ukv: 60
+  ecmwf: 60
 
 # ----------------------------------------------
 # Optimizer