Only allow heap in a number of contrib modules.

Andres Freund <andres@anarazel.de>

Commit: 4b82664156c230b59607704506f5b0a32ef490a2
Author: Andres Freund <andres@anarazel.de>
Date: 2019-04-01T21:57:21Z
Releases: 12.0
Only allow heap in a number of contrib modules.

Contrib modules pgrowlocks, pgstattuple and some functionality in
pageinspect currently only supports the heap table AM. As they are all
concerned with low-level details that aren't reasonably exposed via
tableam, error out if invoked on a non heap relation.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de

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