Messagepack (#12)

* add messagepack attributes

* fix isnullorempty

* bump api version

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

MareSynchronosAPI/Data/HashableDataBase.cs

@@ -1,5 +1,6 @@
 using System.Security.Cryptography;
 using System.Text;
+using MessagePack;
 using Newtonsoft.Json;
 
 namespace MareSynchronos.API.Data;