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

* ideas

* finish components

* systems

* one more

* requested

---------

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

Content.Shared/Trigger/Systems/TriggerOnThrowDoHitSystem.cs

@@ -0,0 +1,19 @@
+using Content.Shared.Throwing;
+using Content.Shared.Trigger.Components.Triggers;
+
+namespace Content.Shared.Trigger.Systems;
+
+public sealed partial class TriggerOnThrowDoHitSystem : TriggerOnXSystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<TriggerOnThrowDoHitComponent, ThrowDoHitEvent>(OnHit);
+    }
+
+    private void OnHit(Entity<TriggerOnThrowDoHitComponent> ent, ref ThrowDoHitEvent args)
+    {
+        Trigger.Trigger(ent.Owner, args.Target, ent.Comp.KeyOut);
+    }
+}