add limits to steal objectives (#22672)

* add ObjectiveLimit comp/system

* give ian and disk limits

* all

* up limit

---------

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

Content.Server/Objectives/Components/ObjectiveLimitComponent.cs

@@ -0,0 +1,20 @@
+using Content.Server.Objectives.Systems;
+
+namespace Content.Server.Objectives.Components;
+
+/// <summary>
+/// Limits the number of traitors that can have the same objective.
+/// Checked by the prototype id, so only considers the exact same objectives.
+/// </summary>
+/// <remarks>
+/// Only works for traitors so don't use for anything else.
+/// </remarks>
+[RegisterComponent, Access(typeof(ObjectiveLimitSystem))]
+public sealed partial class ObjectiveLimitComponent : Component
+{
+    /// <summary>
+    /// Max number of players
+    /// </summary>
+    [DataField(required: true), ViewVariables(VVAccess.ReadWrite)]
+    public uint Limit;
+}