refactor external clients

put model batch size as parameter in config

Azaion.CommonSecurity/Services/ResourceLoader.cs

@@ -0,0 +1,22 @@
+using Azaion.CommonSecurity.DTO.Commands;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Azaion.CommonSecurity.Services;
+
+public interface IResourceLoader
+{
+    MemoryStream LoadFile(string fileName, string? folder = null);
+}
+
+public class ResourceLoader([FromKeyedServices(SecurityConstants.EXTERNAL_INFERENCE_PATH)] IExternalClient externalClient) : IResourceLoader
+{
+    public MemoryStream LoadFile(string fileName, string? folder = null)
+    {
+        externalClient.Send(RemoteCommand.Create(CommandType.Load, new LoadFileData(fileName, folder)));
+        var bytes = externalClient.GetBytes();
+        if (bytes == null)
+            throw new Exception($"Unable to receive {fileName}");
+
+        return new MemoryStream(bytes);
+    }
+}