Splits the singularity into its component parts + ECS singularity + Support for singularities in containers. (#12132)

* InitialCommit (Broken)

* Fixes compile errors

* PR comments. More doc comments. Fixes

* Makes a singularity/event horizon without radiation/physics a valid state to be in

* VV 'fake' setters, fixes the visualizer, fixes the singularity trying to eat itself instead of nearby things.

* Removes unused dependency from Content.Client.GravityWellSystem

* Testing containment and fake VV setters for SingularityGeneratorComponent

* Fixes gravity wells (broken due to LookupFlags.None). Adds recursive Event Horizon consumption

* Fix merge skew

* Fixes for the master merge

* Fix engine commit

* Dirty is obsolete

* Switch over dirty

* Fix requested changes

* ambiant -> ambient

* Moves EventHorionComponent to Shared

* Proper container handling

* Fixes master merge. Fixes post insertion assertions for singularities. Extends proper container handling to gravity wells and the distortion shader.

* Better support for admemes throwing singularities.

* Moves update timing from accumulators to target times

* Update doc comments

Content.Shared/Singularity/Events/SingularityLevelChangedEvent.cs

@@ -0,0 +1,31 @@
+using Content.Shared.Singularity.Components;
+
+namespace Content.Shared.Singularity.Events;
+
+/// <summary>
+/// An event raised whenever a singularity changes its level.
+/// </summary>
+public sealed class SingularityLevelChangedEvent : EntityEventArgs
+{
+    /// <summary>
+    /// The new level of the singularity.
+    /// </summary>
+    public readonly byte NewValue;
+
+    /// <summary>
+    /// The previous level of the singularity.
+    /// </summary>
+    public readonly byte OldValue;
+
+    /// <summary>
+    /// The singularity that just changed level.
+    /// </summary>
+    public readonly SharedSingularityComponent Singularity;
+
+    public SingularityLevelChangedEvent(byte newValue, byte oldValue, SharedSingularityComponent singularity)
+    {
+        NewValue = newValue;
+        OldValue = oldValue;
+        Singularity = singularity;
+    }
+}