move SignalState to shared (#37303)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/DeviceLinking/SharedLogicGate.cs

@@ -40,3 +40,15 @@ public enum LogicGateLayers : byte
     InputB,
     Output
 }
+
+/// <summary>
+/// The possible states of a logic-capable signal.
+/// Stored in network payload data of device network messages.
+/// </summary>
+[Serializable, NetSerializable]
+public enum SignalState : byte
+{
+    Momentary, // Instantaneous pulse high, compatibility behavior
+    Low,
+    High
+}