Separate destructible component threshold into behaviors (#2818)

* WIP changes, add behaviors

* Fix behavior typing, namespace and test

* NO SPACES

Content.Server/GameObjects/Components/Destructible/Thresholds/Behavior/PlaySoundBehavior.cs

@@ -0,0 +1,32 @@
+using Content.Server.GameObjects.EntitySystems;
+using Content.Shared.Audio;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Server.GameObjects.Components.Destructible.Thresholds.Behavior
+{
+    public class PlaySoundBehavior : IThresholdBehavior
+    {
+        /// <summary>
+        ///     Sound played upon destruction.
+        /// </summary>
+        public string Sound { get; set; }
+
+        public void ExposeData(ObjectSerializer serializer)
+        {
+            serializer.DataField(this, x => x.Sound, "sound", string.Empty);
+        }
+
+        public void Trigger(IEntity owner, DestructibleSystem system)
+        {
+            if (string.IsNullOrEmpty(Sound))
+            {
+                return;
+            }
+
+            var pos = owner.Transform.Coordinates;
+
+            system.AudioSystem.PlayAtCoords(Sound, pos, AudioHelpers.WithVariation(0.125f));
+        }
+    }
+}