Persist construction menu favorites server-side (#35867)

* Persist construction menu favorites to player profile

* Use `ProtoId`s for construction favorites

* Validate construction favorites updates from the client

* Actually await the async database call

Content.Shared/Preferences/MsgUpdateConstructionFavorites.cs

@@ -0,0 +1,36 @@
+using Content.Shared.Construction.Prototypes;
+using Lidgren.Network;
+using Robust.Shared.Network;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Preferences;
+
+/// <summary>
+/// The client sends this to update their construction favorites.
+/// </summary>
+public sealed class MsgUpdateConstructionFavorites : NetMessage
+{
+    public override MsgGroups MsgGroup => MsgGroups.Command;
+
+    public List<ProtoId<ConstructionPrototype>> Favorites = [];
+
+    public override void ReadFromBuffer(NetIncomingMessage buffer, IRobustSerializer serializer)
+    {
+        var length = buffer.ReadVariableInt32();
+        Favorites.Clear();
+        for (var i = 0; i < length; i++)
+        {
+            Favorites.Add(new ProtoId<ConstructionPrototype>(buffer.ReadString()));
+        }
+    }
+
+    public override void WriteToBuffer(NetOutgoingMessage buffer, IRobustSerializer serializer)
+    {
+        buffer.WriteVariableInt32(Favorites.Count);
+        foreach (var favorite in Favorites)
+        {
+            buffer.Write(favorite);
+        }
+    }
+}