Candy Bucket for Halloween (#21257)

* Added candy bucket and component to update appearance of held containers akin to it

* cleanup newline

* newline was load-bearing

* moved component to Shared, cleanup

* newline is spooky

* You build and run without errors, stop pretending otherwise

* Updated for new storage system in master branch

Content.Shared/ContainerHeld/ContainerHeldComponent.cs

@@ -0,0 +1,14 @@
+namespace Content.Shared.ContainerHeld;
+
+[RegisterComponent]
+public sealed partial class ContainerHeldComponent: Component
+{
+    /// <summary>
+    ///     The amount of weight needed to be in the container
+    ///     in order for it to toggle it's appearance
+    ///     to ToggleVisuals.Toggled = true, and
+    ///     SetHeldPrefix() to "full" instead of "empty".
+    /// </summary>
+    [DataField("threshold")]
+    public int Threshold { get; private set; } = 1;
+}