feat: add inital in memory dispatcher

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

src/request.result.tests/ErrorTests.cs

@@ -0,0 +1,27 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+namespace Geekeey.Request.Result.Tests;
+
+internal sealed class ErrorTests
+{
+	[Test]
+	public async Task I_can_implicitly_convert_from_string_and_get_string_error()
+	{
+		Error error = "error";
+
+		using var scope = Assert.Multiple();
+		await Assert.That(error).IsTypeOf<StringError>();
+		await Assert.That(error.Message).IsEqualTo("error");
+	}
+
+	[Test]
+	public async Task I_can_implicitly_convert_from_exception_and_get_exception_error()
+	{
+		Error error = new CustomTestException();
+
+		using var scope = Assert.Multiple();
+		var instance = await Assert.That(error).IsTypeOf<ExceptionError>();
+		await Assert.That(instance?.Exception).IsTypeOf<CustomTestException>();
+	}
+}