Layering for atmospheric pipes (#36124)

Co-authored-by: ArtisticRoomba <145879011+ArtisticRoomba@users.noreply.github.com>
Co-authored-by: Kevin Zheng <kevinz5000@gmail.com>

Content.Server/Atmos/Piping/Components/GasPipeManifoldComponent.cs

@@ -0,0 +1,11 @@
+namespace Content.Server.Atmos.Piping.Components;
+
+[RegisterComponent]
+public sealed partial class GasPipeManifoldComponent : Component
+{
+    [DataField("inlets")]
+    public HashSet<string> InletNames { get; set; } = new() { "south0", "south1", "south2" };
+
+    [DataField("outlets")]
+    public HashSet<string> OutletNames { get; set; } = new() { "north0", "north1", "north2" };
+}