gh-89480: Document the gdb helpers (GH-115657)

Content adapted from https://devguide.python.org/development-tools/gdb/#
and https://wiki.python.org/moin/DebuggingWithGdb.

The original content on the Wiki page came from gdb debug help used by
the Launchpad (https://launchpad.net/) team. 
Thanks to Anatoly Techtonik and user `rmf` for substantial improvements to the Wiki page.


The history of the Devguide page follows
(with log entries expanded for major content contributions):

Hugo van Kemenade, Sat Dec 30 21:22:04 2023 +0200
Hugo van Kemenade, Fri Dec 8 12:04:32 2023 +0200
Erlend E. Aasland & Hugo van Kemenade, Tue Aug 8 22:05:34 2023 +0200
Satish Mishra, Sat Feb 11 13:54:57 2023 +0530
Hugo van Kemenade, Fri Dec 23 17:33:33 2022 +0200
Skip Montanaro, Hugo, Erlend, & Ezio, Fri Nov 4 05:04:23 2022 -0500

    Add a GDB tips section to Advanced Tools (#977)
    
Adam Turner, Wed Jun 15 21:19:23 2022 +0100
Adam Turner, Tue Jun 14 11:12:26 2022 +0100
Suriyaa, Fri Jun 8 19:39:23 2018 +0200
Jeff Allen, Tue Oct 24 18:12:53 2017 +0100
Jeff Allen, Fri Oct 13 13:43:43 2017 +0100
Mariatta, Wed Jan 4 09:14:55 2017 -0800
Carol Willing, Mon Sep 26 14:50:54 2016 -0700
Zachary Ware, Thu Jul 21 10:42:23 2016 -0500
Georg Brandl, Mon Nov 3 11:28:19 2014 +0100

    Add instruction how to activate python-gdb.py

Georg Brandl, Sun Mar 9 10:32:01 2014 +0100
Georg Brandl, Tue Apr 3 09:12:53 2012 +0200
Georg Brandl, Sat Mar 5 17:32:35 2011 +0100
Dave Malcolm, Fri Jan 21 12:34:09 2011 -0500

    Add documentation on the gdb extension commands provided in libpython.py
    
    I adapted this from documentation I wrote for the Fedora wiki:
      https://fedoraproject.org/wiki/Features/EasierPythonDebugging#New_gdb_commands
    reformatting it as rst, and making other minor changes

Brett Cannon, Thu Jan 20 15:16:52 2011 -0800
Dave Malcolm, Thu Jan 20 16:17:23 2011 -0500

    Add some notes on the gdb pretty-printer hooks

Antoine Pitrou, Thu Jan 20 21:17:49 2011 +0100

    Give an example backtrace

Antoine Pitrou, Thu Jan 20 21:03:06 2011 +0100

    Expand explanations about gdb support

Brett Cannon, Thu Jan 20 11:33:36 2011 -0800

    Tweak the gdb support title to fit in better with the devguide.

Brett Cannon, Mon Jan 17 21:12:54 2011 +0000

    Short README on gdb support.


Co-authored-by: Adam Turner <9087854+aa-turner@users.noreply.github.com>
Co-authored-by: anatoly techtonik <techtonik@gmail.com>
Co-authored-by: Antoine Pitrou <solipsis@pitrou.net>
Co-authored-by: Brett Cannon <brett@python.org>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>
Co-authored-by: Dave Malcolm <dmalcolm@redhat.com>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Georg Brandl <georg@python.org>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Jeff Allen <ja.py@farowl.co.uk>
Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Satish Mishra <7506satish@gmail.com>
Co-authored-by: Skip Montanaro <skip.montanaro@gmail.com>
Co-authored-by: Suriyaa <isc.suriyaa@gmail.com>
Co-authored-by: Zachary Ware <zachary.ware@gmail.com>