add new salv loot into the vgroid procgen (#31290)

add new loot into vgroid procgen

Content.Shared/Procedural/DungeonLayers/EntityTableDunGen.cs

@@ -0,0 +1,21 @@
+using Content.Shared.EntityTable.EntitySelectors;
+
+namespace Content.Shared.Procedural.DungeonLayers;
+
+
+/// <summary>
+/// Spawns entities inside of the dungeon randomly.
+/// </summary>
+public sealed partial class EntityTableDunGen : IDunGenLayer
+{
+    // Counts separate to config to avoid some duplication.
+
+    [DataField]
+    public int MinCount = 1;
+
+    [DataField]
+    public int MaxCount = 1;
+
+    [DataField(required: true)]
+    public EntityTableSelector Table;
+}