add IsMemberOfAny to faction system (#32975)

* add IsMemberOfAny to faction system

* pro

---------

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

Content.Shared/NPC/Systems/NpcFactionSystem.cs

@@ -81,6 +81,24 @@ public sealed partial class NpcFactionSystem : EntitySystem
         return ent.Comp.Factions.Contains(faction);
     }
 
+    /// <summary>
+    /// Returns whether an entity is a member of any listed faction.
+    /// If the list is empty this returns false.
+    /// </summary>
+    public bool IsMemberOfAny(Entity<NpcFactionMemberComponent?> ent, IEnumerable<ProtoId<NpcFactionPrototype>> factions)
+    {
+        if (!Resolve(ent, ref ent.Comp, false))
+            return false;
+
+        foreach (var faction in factions)
+        {
+            if (ent.Comp.Factions.Contains(faction))
+                return true;
+        }
+
+        return false;
+    }
+
     /// <summary>
     /// Adds this entity to the particular faction.
     /// </summary>