added optional request tracing id for much better logs reading

CryptoExchange.Net/Interfaces/IRequest.cs

@@ -27,6 +27,10 @@ namespace CryptoExchange.Net.Interfaces
         /// </summary>
         Uri Uri { get; }
         /// <summary>
+        /// internal request id for tracing
+        /// </summary>
+        string? RequestId { get; }
+        /// <summary>
         /// Set byte content
         /// </summary>
         /// <param name="data"></param>

CryptoExchange.Net/Interfaces/IRequestFactory.cs

@@ -22,6 +22,7 @@ namespace CryptoExchange.Net.Interfaces
         /// </summary>
         /// <param name="requestTimeout">Request timeout to use</param>
         /// <param name="proxy">Proxy settings to use</param>
-        void Configure(TimeSpan requestTimeout, ApiProxy? proxy);
+        /// <param name="isTracingEnabled">Should generate unique id for requests</param>
+        void Configure(TimeSpan requestTimeout, ApiProxy? proxy, bool isTracingEnabled=false);
     }
 }