some refactoring

MareSynchronosServer/MareSynchronosShared/Utils/Configuration/IMareConfiguration.cs

@@ -0,0 +1,8 @@
+namespace MareSynchronosShared.Utils.Configuration;
+
+public interface IMareConfiguration
+{
+    T GetValueOrDefault<T>(string key, T defaultValue);
+    T GetValue<T>(string key);
+    string SerializeValue(string key, string defaultValue);
+}