let file shards register against main or so

MareSynchronosServer/MareSynchronosShared/Services/IConfigurationService.cs

@@ -5,6 +5,9 @@ namespace MareSynchronosShared.Services;
 public interface IConfigurationService<T> where T : class, IMareConfiguration
 {
     bool IsMain { get; }
+
+    event EventHandler ConfigChangedEvent;
+
     T1 GetValue<T1>(string key);
     T1 GetValueOrDefault<T1>(string key, T1 defaultValue);
     string ToString();