uncloak ninja after attacking (#20892)

* raise MeleeAttackEvent on the user after swinging

* add disable bool to RevealNinja

* uncloak ninja after attacking

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Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Weapons/Melee/Events/MeleeAttackEvent.cs

@@ -0,0 +1,7 @@
+namespace Content.Shared.Weapons.Melee.Events;
+
+/// <summary>
+/// Event raised on the user after attacking with a melee weapon, regardless of whether it hit anything.
+/// </summary>
+[ByRefEvent]
+public record struct MeleeAttackEvent(EntityUid Weapon);