feat(spark-lineage): coalesce spark jobs #5077
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This PR enables to coalesce all spark jobs under one application into single job. All input output datasets will be attached to single job.
This behaviour can be enabled by setting "spark.datahub.coalesce_jobs" config to true.
If "spark.datahub.parent.datajob_urn" config is set then specified dataset will be added as a upstream dataset.
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