[Feature Request] Fully support target-async on

When the session starts it sends:

-gdb-set target-async on

This is intended to enable asynchronuos commands, see https://sourceware.org/gdb/onlinedocs/gdb/Asynchronous-and-non_002dstop-modes.html

Whether the debugger actually supports it can then be checked using -list-target-features which will respond with something like:

^done,target-features=["async"]

If "async" appears in the target-features list, the debugger supports asynchronuos commands.

However, it never asks to see the supported target-features and starting the debugger and trying to issue commands results in:

Unable to perform this action because the process is running.

Looking in MICore/CommandFactories/gdb.cs in AllowCommandsWhileRunning(), and from what I can see there, it just says false.

Commencez dans MICore/CommandFactories/gdb.cs, en particulier dans AllowCommandsWhileRunning(), et suivez les commandes de démarrage de session autour de -gdb-set target-async on. Examinez la manière dont les réponses de -list-target-features sont traitées et dont les autorisations des commandes pendant l’exécution sont déterminées. La tâche sera considérée comme terminée lorsque les cibles asynchrones prises en charge seront reconnues et que les commandes n’échoueront plus uniquement parce que le processus est en cours d’exécution.