OTel Span in flagd Provider

[Kavindu-Dodan]

The flagd provider should start an OTel span that will be passed to flagd to get cross-service tracing for evaluation.

[Kavindu-Dodan]

Researched on otel for java. Telemetry can be worked without any sdk change thanks to otel java automatic instrumentation - https://opentelemetry.io/docs/instrumentation/java/automatic/

Next step - check if we have the necessary details and if not attempt to add them

[Kavindu-Dodan]

One use-case to address is the manual instrumentation [1]. This requires a OpenTelemetry instance to be present at sdk level, so that we can instrument grpc connection. Investigating this aspect and code solution

[1] - https://opentelemetry.io/docs/instrumentation/java/manual/