feat: add inital in memory dispatcher

Add a simple in memory dispatcher for scalar requests and stream request.

src/request.result/_errors/ExceptionError.cs

@@ -0,0 +1,29 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result;
+
+/// <summary>
+/// An error which is constructed from an exception.
+/// </summary>
+public sealed class ExceptionError : Error
+{
+	/// <summary>
+	/// An error which is constructed from an exception.
+	/// </summary>
+	/// <param name="exception">The exception in the error.</param>
+	public ExceptionError(Exception exception)
+	{
+		Exception = exception;
+	}
+
+	/// <summary>
+	/// The exception in the error.
+	/// </summary>
+	public Exception Exception { get; }
+
+	/// <summary>
+	/// The exception in the error.
+	/// </summary>
+	public override string Message => Exception.Message;
+}