Messagepack (#12)

* add messagepack attributes

* fix isnullorempty

* bump api version

---------

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

MareSynchronosAPI/Data/CharacterData.cs

@@ -1,7 +1,9 @@
 using MareSynchronos.API.Data.Enum;
+using MessagePack;
 
 namespace MareSynchronos.API.Data;
 
+[MessagePackObject(keyAsPropertyName: true)]
 public class CharacterData : HashableDataBase
 {
     public Dictionary<ObjectKind, List<FileReplacementData>> FileReplacements { get; set; } = new();