Hand pickup and drop triggers (#39663)

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

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+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Triggers an entity when it is equips an item into one of its hand slots.
+/// The user is the entity that was equipped.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnDidEquipHandComponent : BaseTriggerOnXComponent;

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

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+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Triggers an entity when it is drops an item from one of its hand slots.
+/// The user is the entity that was dropped.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnDidUnequipHandComponent : BaseTriggerOnXComponent;

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

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+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;

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

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+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Triggers an item when it is equipped into a hand slot.
+/// The user is the entity that picked the item up.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnGotEquippedHandComponent : BaseTriggerOnXComponent;

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

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+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Triggers an item when it is dropped from a hand slot.
+/// The user is the entity that dropped the item.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnGotUnequippedHandComponent : BaseTriggerOnXComponent;