[PATCHv2] gdb: add Python events for program space addition and removal

[Eli Zaretskii]

> Date: Wed, 27 Sep 2023 16:16:55 +0100
> From: Andrew Burgess via Gdb-patches <gdb-patches@sourceware.org>
> Cc: Tom Tromey <tom@tromey.com>
> 
>  gdb/NEWS                                      |   7 +
>  gdb/doc/python.texi                           |  28 ++++
>  gdb/observable.c                              |   2 +
>  gdb/observable.h                              |   7 +
>  gdb/progspace.c                               |   3 +
>  gdb/python/py-all-events.def                  |   2 +
>  gdb/python/py-event-types.def                 |  10 ++
>  gdb/python/py-progspace.c                     |  67 ++++++++++
>  .../gdb.python/py-progspace-events.c          |  73 ++++++++++
>  .../gdb.python/py-progspace-events.exp        | 125 ++++++++++++++++++
>  .../gdb.python/py-progspace-events.py         |  29 ++++
>  11 files changed, 353 insertions(+)
>  create mode 100644 gdb/testsuite/gdb.python/py-progspace-events.c
>  create mode 100644 gdb/testsuite/gdb.python/py-progspace-events.exp
>  create mode 100644 gdb/testsuite/gdb.python/py-progspace-events.py

OK for the documentation parts, thanks.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>