5 new triggers: EmptyContainers, Knockdown, Stun, TriggerOnThrowDoHit (#41472)

* ideas

* finish components

* systems

* one more

* requested

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Co-authored-by: iaada <iaada@users.noreply.github.com>

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

@@ -0,0 +1,10 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Trigger.Components.Triggers;
+
+/// <summary>
+/// Trigger for when this entity is thrown and then hits a second entity.
+/// User is the entity hit.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TriggerOnThrowDoHitComponent : BaseTriggerOnXComponent;