.NET: Update OpenTelemetry Agent - Added Demo, AIAgentMetadata and Agent.GetService() (#356)
* OTEL Demo
* updating telemetry sample
* OTEL updates
* WIP
* Adding GetService and Agent Metadata for Telemetry
* WIP
* Add UT for OTEL System behavior
* Address Unicode problem
* Add logging
* Adjust for new extensions
* Change Logger to LoggerFactory for the extension method
* Address AI Feedback
* Simplify script and readme just for Azure OpenAI
* Increase code converage
* Address merge conflict
* Another slnx fix
* Address PR comments
* Address PR feedback + Add UT
* Added Hosting UT to the solution
* Address PR comments
* Address missing sensitivity tests
* Remove unecessary override
* Address PR comments