Merge pull request #4753 from neutrinoceros/ytsimulationnotidentified…

…_better_message

UX: add info about supported simulation types in YTSimulationNotIdentified

yt/utilities/exceptions.py

@@ -196,7 +196,12 @@ def __init__(self, sim_type):
         self.sim_type = sim_type
 
     def __str__(self):
-        return f"Simulation time-series type {self.sim_type!r} not defined."
+        from yt.utilities.object_registries import simulation_time_series_registry
+
+        return (
+            f"Simulation time-series type {self.sim_type!r} not defined. "
+            f"Supported types are {list(simulation_time_series_registry)}"
+        )
 
 
 class YTCannotParseFieldDisplayName(YTException):