Add REST action handling in InvokeRecActionCommand

Refactor `using` directives in `InvokeRecActionCommand.cs` to include `DigitalData.Core.Exceptions` and `System.Net.Http`.

Implement logic in `InvokeRecActionCommandHandler` to handle different REST actions using `HttpClient`. Introduce a `switch` statement to process "GET", "POST", "PUT", and "DELETE" actions, with a `BadRequestException` for unsupported types. Read HTTP response content asynchronously.

src/ReC.Application/RecActions/Commands/InvokeRecActionCommand.cs

@@ -1,5 +1,7 @@
-using MediatR;
+using DigitalData.Core.Exceptions;
+using MediatR;
 using ReC.Application.RecActions.Queries;
+using System.Net.Http;
 
 namespace ReC.Application.RecActions.Commands;
 
@@ -18,5 +20,31 @@ public class InvokeRecActionCommandHandler(ISender sender) : IRequestHandler<Inv
     public async Task Handle(InvokeRecActionCommand request, CancellationToken cancel)
     {
         var actions = await sender.Send(request as ReadRecActionQuery, cancel);
+
+        foreach (var action in actions)
+        {
+            using var http = new HttpClient();
+            using var response = await http.GetAsync("https://example.com", cancel);
+
+            switch (action.RestType)
+            {
+                case "GET":
+                    // Handle GET
+                    break;
+                case "POST":
+                    // Handle POST
+                    break;
+                case "PUT":
+                    // Handle PUT
+                    break;
+                case "DELETE":
+                    // Handle DELETE
+                    break;
+                default:
+                    throw new BadRequestException($"The REST type {action.RestType} is not supported.");
+            }
+
+            var content = await response.Content.ReadAsStringAsync(cancel);
+        }
     }
 }