make fully stateful in module ga.

tensorneat/algorithm/neat/ga/mutation/base.py

@@ -1,3 +1,10 @@
+from utils import State
+
+
 class BaseMutation:
-    def __call__(self, key, genome, nodes, conns, new_node_key):
-        raise NotImplementedError
+
+    def setup(self, state=State()):
+        return state
+
+    def __call__(self, state, key, genome, nodes, conns, new_node_key):
+        raise NotImplementedError