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* Dirty is obsolete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.Server/Singularity/Events/EventHorizonAttemptConsumeEntityEvent.cs

@@ -0,0 +1,26 @@
+using Content.Shared.Singularity.Components;
+
+namespace Content.Server.Singularity.Events;
+
+/// <summary>
+/// Event raised on the target entity whenever an event horizon attempts to consume an entity.
+/// Can be cancelled to prevent the target entity from being consumed.
+/// </summary>
+public sealed class EventHorizonAttemptConsumeEntityEvent : CancellableEntityEventArgs
+{
+    /// <summary>
+    /// The entity that the event horizon is attempting to consume.
+    /// </summary>
+    public readonly EntityUid Entity;
+
+    /// <summary>
+    /// The event horizon consuming the target entity.
+    /// </summary>
+    public readonly EventHorizonComponent EventHorizon;
+
+    public EventHorizonAttemptConsumeEntityEvent(EntityUid entity, EventHorizonComponent eventHorizon)
+    {
+        Entity = entity;
+        EventHorizon = eventHorizon;
+    }
+}