Refactor InsertEndpointProcedure; add MediatR handler

Refactored InsertEndpointProcedure to remove the ToObjectProcedure method, making it a simple data record. Introduced InsertEndpointProcedureHandler using MediatR's IRequestHandler to handle insert commands asynchronously. Added necessary MediatR using directives.

src/ReC.Application/Endpoints/Commands/InsertEndpointProcedure.cs

@@ -1,4 +1,5 @@
-using ReC.Application.Common.Procedures.InsertProcedure;
+using MediatR;
+using ReC.Application.Common.Procedures.InsertProcedure;
 
 namespace ReC.Application.Endpoints.Commands;
 
@@ -7,13 +8,16 @@ public record InsertEndpointProcedure : IInsertProcedure
     public bool? Active { get; set; }
     public string? Description { get; set; }
     public string? Uri { get; set; }
+}
 
-    public InsertObjectProcedure ToObjectProcedure(string? addedWho = null)
+public class InsertEndpointProcedureHandler(ISender sender) : IRequestHandler<InsertEndpointProcedure, long>
+{
+    public async Task<long> Handle(InsertEndpointProcedure request, CancellationToken cancel)
     {
-        return new InsertObjectProcedure
+        return await sender.Send(new InsertObjectProcedure
         {
             Entity = "ENDPOINT",
-            Endpoint = this
-        }.AddedBy(addedWho);
+            Endpoint = request
+        }, cancel);
     }
 }