Hand pickup and drop triggers (#39663)

Content.Shared/Trigger/Components/Triggers/TriggerOnDroppedComponent.cs

@@ -0,0 +1,10 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Triggers an entity when it is dropped from a users hands, or directly removed from a users inventory, but not when moved between hands & inventory.
+/// The user is the player that was holding or wearing the item.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnDroppedComponent : BaseTriggerOnXComponent;