states: Don't require a name

simplifies the API

mesa/experimental/states.py

@@ -22,9 +22,8 @@
 class State:
     """Base class for all states."""
 
-    def __init__(self, name: str, initial_value: Any):
+    def __init__(self, initial_value: Any):
         """Create a new state."""
-        self.name = name
         self._value = initial_value
         self._last_update_time = 0
         self.model = None  # Set when state is added to agent