Add Kiota client.

Marechai.App/Services/CompositeSerializationWriterFactory.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Kiota.Abstractions.Serialization;
+
+namespace Marechai.App.Services;
+
+public class CompositeSerializationWriterFactory : ISerializationWriterFactory
+{
+    // Internal list of registered factories.
+    private readonly List<ISerializationWriterFactory> _factories = new();
+
+    // This method loops through each registered factory and returns the first one that supports the content type.
+    public ISerializationWriter GetSerializationWriter(string contentType)
+    {
+        foreach(ISerializationWriterFactory factory in _factories)
+        {
+            try
+            {
+                ISerializationWriter? writer = factory.GetSerializationWriter(contentType);
+
+                if(writer != null) return writer;
+            }
+            catch(ArgumentOutOfRangeException)
+            {
+                // This factory doesn't support the content type; try the next.
+            }
+        }
+
+        throw new ArgumentOutOfRangeException(nameof(contentType),
+                                              $"No serialization writer is registered for content type: {contentType}");
+    }
+
+    /// <inheritdoc />
+    public string ValidContentType => string.Join(";", _factories.Select(f => f.ValidContentType));
+
+    // Add a new factory to the composite.
+    public void AddFactory(ISerializationWriterFactory writerFactory)
+    {
+        if(writerFactory == null) throw new ArgumentNullException(nameof(writerFactory));
+        _factories.Add(writerFactory);
+    }
+}