Messagepack (#12)

* add messagepack attributes

* fix isnullorempty

* bump api version

---------

Co-authored-by: rootdarkarchon <root.darkarchon@outlook.com>

MareSynchronosAPI/Data/UserData.cs

@@ -1,6 +1,10 @@
-namespace MareSynchronos.API.Data;
+using MessagePack;
 
+namespace MareSynchronos.API.Data;
+
+[MessagePackObject(keyAsPropertyName: true)]
 public record UserData(string UID, string? Alias = null)
 {
-    public string AliasOrUID => Alias ?? UID;
+    [IgnoreMember]
+    public string AliasOrUID => string.IsNullOrWhiteSpace(Alias) ? UID : Alias;
 }