[APM]Improve performance of join_by_key #178177
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Summary
Improve performance of join_by_key from O(n^2) to O(n).
closes #176073
Fix https://discuss.elastic.co/t/kibana-terribly-slow-on-apm-traces/312664
@cauemarcondes
After solving the unit testing problem, the performance degraded back to O (n^2).
This PR fix the performance problem, please review and test again.