Separate destructible component threshold into behaviors (#2818)

* WIP changes, add behaviors

* Fix behavior typing, namespace and test

* NO SPACES

Content.Server/GameObjects/EntitySystems/DestructibleSystem.cs

@@ -0,0 +1,26 @@
+using Content.Shared.GameObjects.EntitySystems;
+using JetBrains.Annotations;
+using Robust.Server.GameObjects.EntitySystems;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Interfaces.Random;
+using Robust.Shared.IoC;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class DestructibleSystem : EntitySystem
+    {
+        [Dependency] public readonly IRobustRandom Random = default!;
+        
+        public AudioSystem AudioSystem { get; private set; }
+        public ActSystem ActSystem { get; private set; }
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            AudioSystem = Get<AudioSystem>();
+            ActSystem = Get<ActSystem>();
+        }
+    }
+}