feature: exports api refactoring

Disco.Models/Exporting/ExportMetadata.cs

@@ -1,10 +1,19 @@
-using System.Collections.Generic;
+using Disco.Models.Services.Exporting;
+using System.Collections.Generic;
 
 namespace Disco.Models.Exporting
 {
-    public class ExportMetadata<T>
-        : List<ExportMetadataField<T>> where T : IExportRecord
+    public class ExportMetadata<O, R>
+        : List<ExportMetadataField<R>>
+        where O : IExportOptions
+        where R : IExportRecord
     {
         public List<string> IgnoreShortNames { get; } = new List<string>();
+        public O Options { get; set; }
+
+        public ExportMetadata(O options)
+        {
+            Options = options;
+        }
     }
 }