[#7742] export trace info for agent-sdk #9175
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Resolve issue #7742.
Related PR #6801.
Feature
Export txId & spanId to application via pinpoint agent sdk. Disabled by default. It can be enabled by pinpoint config profiler.export.trace.info=true or jvm property: -Dprofiler.export.trace.info=true.
Usage
If my application need to save/notify some system the txId/spanId, i could
Scene
Get the transaction id and process it in a programming way(like saving to a persistent db).
Before this PR, we could only get the txId/spanId from slf4j.MDC in a hacky way.