Implement type regcollation

Peter Eisentraut <peter@eisentraut.org>

Commit: a2b1faa0f279f18517adc1dd969e5f026eb51d33
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-03-18T20:21:00Z
Releases: 13.0
Implement type regcollation

This will be helpful for a following commit and it's also just
generally useful, like the other reg* types.

Author: Julien Rouhaud
Reviewed-by: Thomas Munro and Michael Paquier
Discussion: https://postgr.es/m/CAEepm%3D0uEQCpfq_%2BLYFBdArCe4Ot98t1aR4eYiYTe%3DyavQygiQ%40mail.gmail.com

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