* [OPIK-446] Add durartion to trace_span

* Fix calc

* Fix pr review

* OPIK-446 remove spans calculated duration

* OPIK-446 remove traces calculated duration

* OPIK-446 changed DurationUtils to be a test utility

* OPIK-446 changed query builder to use the materialized column

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Co-authored-by: Ido Berkovich <ido@comet.com>