rework configuration save, load configuration backups when available and config cannot be read

fix unnecessary config reload on save

MareSynchronos/MareConfiguration/IConfigService.cs

@@ -0,0 +1,12 @@
+using MareSynchronos.MareConfiguration.Configurations;
+
+namespace MareSynchronos.MareConfiguration;
+
+public interface IConfigService<out T> : IDisposable where T : IMareConfiguration
+{
+    T Current { get; }
+    string ConfigurationName { get; }
+    string ConfigurationPath { get; }
+    public event EventHandler? ConfigSave;
+    void UpdateLastWriteTime();
+}