Entity Tables (EntitySpawnEntry replacement) (#30579)

* Entity table code

* entity table examples

* fix dat shit

* access

* tests tests tests

* sloth review

Content.Shared/EntityTable/ValueSelector/NumberSelector.cs

@@ -0,0 +1,16 @@
+using Content.Shared.EntityTable.EntitySelectors;
+using JetBrains.Annotations;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.EntityTable.ValueSelector;
+
+/// <summary>
+/// Used for implementing custom value selection for <see cref="EntityTableSelector"/>
+/// </summary>
+[ImplicitDataDefinitionForInheritors, UsedImplicitly(ImplicitUseTargetFlags.WithInheritors)]
+public abstract partial class NumberSelector
+{
+    public abstract float Get(System.Random rand,
+        IEntityManager entMan,
+        IPrototypeManager proto);
+}