add user_name to Control Table

Author: alexevag

src/ethopy/core/experiment.py

@@ -1105,6 +1105,7 @@ class Control(dj.Lookup):  # noqa: D101
     notes=''                    : varchar(256)
     queue_size=0                : int
     ip=null                     : varchar(16)                  # setup IP address
+    user_name                   : varchar(256)
     """  # noqa: E501