Add hooks for session start and session end, take two

Michael Paquier <michael@paquier.xyz>

Commit: e788bd924c19e296bd34316e30e3ba1b68354e64
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-10-01T03:15:25Z
Releases: 13.0
Add hooks for session start and session end, take two

These hooks can be used in loadable modules.  A simple test module is
included.

The first attempt was done with cd8ce3a but we lacked handling for
NO_INSTALLCHECK in the MSVC scripts (problem solved afterwards by
431f1599) so the buildfarm got angry.  This also fixes a couple of
issues noticed upon review compared to the first attempt, so the code
has slightly changed, resulting in a more simple test module.

Author: Fabrízio de Royes Mello, Yugo Nagata
Reviewed-by: Andrew Dunstan, Michael Paquier, Aleksandr Parfenov
Discussion: https://postgr.es/m/20170720204733.40f2b7eb.nagata@sraoss.co.jp
Discussion: https://postgr.es/m/20190823042602.GB5275@paquier.xyz

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