ARROW-5716: [Developer] Improve merge PR script to attribute multiple authors #4882
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See https://help.github.com/en/articles/creating-a-commit-with-multiple-authors. So when multiple people contribute to a PR it will show up in their contribution count. In the past we have only attributed the person with the most commits, or in the event of a tie, the most recent committer in a PR. We're having more PRs with multiple people involved so I think it's nice to acknowledge everyone.
I also added the Signed-off-by: mark which includes the Apache committer information in the commit message
This was implemented in Apache Spark in https://github.com/apache/spark/blob/master/dev/merge_spark_pr.py so I've adopted the approach here.