Pressure & volume pumps can be toggled on/off now. (#3046)

This tidbit might or might not be suitable for a separate component.
Tell me in PR comments I guess.

Content.Server/GameObjects/Components/Atmos/Piping/Pumps/VolumePumpComponent.cs

@@ -1,6 +1,7 @@
 #nullable enable
 using System;
 using Content.Server.Atmos;
+using Content.Shared.Interfaces.GameObjects.Components;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;
@@ -9,6 +10,7 @@ namespace Content.Server.GameObjects.Components.Atmos.Piping.Pumps
 {
     [RegisterComponent]
     [ComponentReference(typeof(BasePumpComponent))]
+    [ComponentReference(typeof(IActivate))]
     public class VolumePumpComponent : BasePumpComponent
     {
         [ViewVariables(VVAccess.ReadWrite)]