Add a script and a config file to run perlcritic

Andrew Dunstan <andrew@dunslane.net>

Commit: 91703ca2144e58d041c132fb7ff06a6d1721e904
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2018-05-09T11:55:23Z
Releases: 11.0
Add a script and a config file to run perlcritic

This is similar to what we do to run perltidy. For now we only run at
severity level 5. Over time we can improve our perl code and reduce the
severity level.

Discussion: https://postgr.es/m/86aa2a3a-0c68-21fb-9560-84ad6914d561@2ndQuadrant.com

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