chore: initial repository scaffold

- Add Hrynco.RabbitMq class library with RabbitMQ client abstractions
- Add Hrynco.RabbitMq.Tests xunit project
- ImplicitUsings disabled on all projects

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Hrynco.RabbitMq/CorrelationContext.cs

@@ -0,0 +1,6 @@
+namespace Hrynco.RabbitMq;
+
+public record CorrelationContext
+{
+    public required string CorrelationId { get; init; }
+}