pet dehydrated fish to make him nice to you (#14709)

* petting fish to make him nice to you

* fix fishe, refactor a bit

* fishe

* pro

* feedback, for now

* refactor

* pro

---------

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

Content.Server/NPC/Components/FactionExceptionComponent.cs

@@ -0,0 +1,17 @@
+using Content.Server.NPC.Systems;
+
+namespace Content.Server.NPC.Components;
+
+/// <summary>
+/// Prevents an NPC from attacking ignored entities from enemy factions.
+/// Can be added to if pettable, see PettableFriendComponent.
+/// </summary>
+[RegisterComponent, Access(typeof(FactionExceptionSystem))]
+public sealed class FactionExceptionComponent : Component
+{
+    /// <summary>
+    /// List of entities that this NPC will refuse to attack
+    /// </summary>
+    [DataField("ignored")]
+    public HashSet<EntityUid> Ignored = new();
+}