Updated for Context Propagation and Baggage Data Insert/Extract

[itsJamilAhmed]

1. Amended DirectPublisherWithManualInstrumentation to add example span attributes and baggage for contextual information.
2. Added a new QueueSubscriberWithManualInstrumentation that creates a receive and processing span
3. Included an example of using HTTP OTLP Endpoints with Authorization headers in TracingUtil
4. Additional comments and references