add some default types to de-duplicate similar implmentations

Pilz.Net/Extensions/ApiMessageExtensions.cs

@@ -0,0 +1,36 @@
+using Pilz.Net.Api;
+using Pilz.Net.Api.Messages;
+
+namespace Pilz.Net.Extensions;
+
+public static class ApiMessageExtensions
+{
+    public static ApiResult ToItemResult<T>(this T? @this)
+    {
+        if (@this == null)
+            return ApiResult.NotFound();
+        return ApiResult.Ok(@this.ToItemMsg());
+    }
+
+    public static ApiResult ToItemsResult<T>(this IEnumerable<T>? @this)
+    {
+        if (@this == null)
+            return ApiResult.NotFound();
+        return ApiResult.Ok(@this.ToItemsMsg());
+    }
+
+    public static GeneralItemMessages<T>.Item ToItemMsg<T>(this T @this)
+    {
+        return new GeneralItemMessages<T>.Item(@this);
+    }
+
+    public static GeneralItemMessages<T>.Items ToItemsMsg<T>(this IEnumerable<T> @this)
+    {
+        return new GeneralItemMessages<T>.Items([.. @this]);
+    }
+
+    public static GeneralItemMessages<T>.Items ToItemsMsg<T>(this T[] @this)
+    {
+        return new GeneralItemMessages<T>.Items([.. @this]);
+    }
+}