Allow sound to play at the start of anomaly supercritical animation (#36260)

* Add datafield to AnomalyComponent to play a sound when an anomaly enters supercriticality

* use Entity<T> pattern

* use implicit default for nullable

* don't forget to resolve the AnomalyComponent...

* Add comment for StartSupercriticalEvent "ent" parameter

* use implicit casts from Entity<T> to EntityUid

* StartSupercriticalEvent requires AnomalyComponent to resolve

Content.Shared/Anomaly/Components/AnomalyComponent.cs

@@ -129,6 +129,12 @@ public sealed partial class AnomalyComponent : Component
     /// </summary>
     [DataField]
     public SoundSpecifier? SupercriticalSound = new SoundCollectionSpecifier("Explosion");
+
+    /// <summary>
+    /// The sound plays at the start of the animation when an anomaly goes supercritical
+    /// </summary>
+    [DataField]
+    public SoundSpecifier? SupercriticalSoundAtAnimationStart;
     #endregion
 
     /// <summary>