Entity Tables (EntitySpawnEntry replacement) (#30579)

* Entity table code

* entity table examples

* fix dat shit

* access

* tests tests tests

* sloth review

Content.Shared/EntityTable/EntityTablePrototype.cs

@@ -0,0 +1,18 @@
+using Content.Shared.EntityTable.EntitySelectors;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.EntityTable;
+
+/// <summary>
+/// This is a prototype for...
+/// </summary>
+[Prototype]
+public sealed partial class EntityTablePrototype : IPrototype
+{
+    /// <inheritdoc/>
+    [IdDataField]
+    public string ID { get; } = default!;
+
+    [DataField(required: true)]
+    public EntityTableSelector Table = default!;
+}