Entity Tables (EntitySpawnEntry replacement) (#30579)

* Entity table code

* entity table examples

* fix dat shit

* access

* tests tests tests

* sloth review

Content.Shared/EntityTable/EntityTableSystem.cs

@@ -0,0 +1,20 @@
+using Content.Shared.EntityTable.EntitySelectors;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+
+namespace Content.Shared.EntityTable;
+
+public sealed class EntityTableSystem : EntitySystem
+{
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public IEnumerable<EntProtoId> GetSpawns(EntityTableSelector? table, System.Random? rand = null)
+    {
+        if (table == null)
+            return new List<EntProtoId>();
+
+        rand ??= _random.GetRandom();
+        return table.GetSpawns(rand, EntityManager, _prototypeManager);
+    }
+}