Ability to export trace span

[cmergenthaler]

Feature Description

The old xk6-distributed-tracing extension (until refactoring) had the ability to export the created traces/spans to a tracing backend. This is useful to save additional information (e.g. unique k6-run id) to the spans in order to filter traces in the end. I think generally speaking, not exporting the root span to a trace backend is not really beneficial.

Would be nice to have this feature in the trace module available.

Suggested Solution (optional)

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Already existing or connected issues / PRs (optional)

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