Add test module injection_points

Michael Paquier <michael@paquier.xyz>

Commit: 49cd2b93d7dbceefdf9a71cc301d284a2dd234c3
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-01-22T04:32:28Z
Releases: 17.0
Add test module injection_points

This provides basic coverage for injection points within a single
process, while providing some callbacks that can be used for other
tests.  There are plans to extend this module later with more
advanced capabilities for tests.

Author: Michael Paquier, with comment fixes from Ashutosh Bapat.
Reviewed-by: Ashutosh Bapat, Nathan Bossart, Álvaro Herrera, Dilip
Kumar, Amul Sul, Nazir Bilal Yavuz
Discussion: https://postgr.es/m/ZTiV8tn_MIb_H2rE@paquier.xyz

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