Change \conninfo to use tabular format

(Initially the proposal was to keep \conninfo alone and add this feature
as \conninfo+, but we decided against keeping the original.)

Also display more fields than before, though not as many as were
suggested during the discussion.  In particular, we don't show 'role'
nor 'session authorization', for both which a case can probably be made.
These can be added as followup commits, if we agree to it.

Some (most?) reviewers actually reviewed rather different versions of
the patch and do not necessarily endorse the current one.

Co-authored-by: Maiquel Grassi <grassi@hotmail.com.br>
Co-authored-by: Hunaid Sohail <hunaidpgml@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Sami Imseih <simseih@amazon.com>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Pavel Luzanov <p.luzanov@postgrespro.ru>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Erik Wienhold <ewie@ewie.name>
Discussion: https://postgr.es/m/CP8P284MB24965CB63DAC00FC0EA4A475EC462@CP8P284MB2496.BRAP284.PROD.OUTLOOK.COM

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