Allow setting Spark job descriptions at runtime with the current job

[yruslan]

Background

Dynamic job descriptions can help tracking which table the current running Pramen job is processing

Feature

Allow setting Spark job descriptions at runtime with the current job.

Example [Optional]

pramen.job.description.template = "Running ingestion of @metastoreTable..."

or

pramen.job.description.template = "Pramen - running @pipeline, job @jobName"

Proposed Solution [Optional]

spark.sparkContext.setJobDescription(s)