libpq_pipeline: add PQtrace() support and tests

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 7bebd0d00998a28449d83376f4bcdeec65d5eea6
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2021-03-30T23:33:04Z
Releases: 14.0
libpq_pipeline: add PQtrace() support and tests

The libpq_pipeline program recently introduced by commit acb7e4eb6b1c
is well equipped to test the PQtrace() functionality, so let's make it
do that.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20210327192812.GA25115@alvherre.pgsql

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