Use bash subshell for procfs interpolation of cmdline file

[mdeguzis]

See #449

Base stackexchange reasoning: https://unix.stackexchange.com/questions/243142/how-to-show-quoted-command-list/567021#567021

Further reading: https://unix.stackexchange.com/questions/432419/unexpected-non-null-encoding-of-proc-pid-cmdline/432681#432681

Testing

$ pgrep -a vim
70431 vim --cmd set pythonthreehome=/project/env/altternative/python3.8 /home/mdeguzis/.tmux.conf
74234 vim --cmd set pythonthreehome=/project/env/altternative/python3.8 save_command_strategies/linux_procfs.sh
91608 vim --cmd set pythonthreehome=/project/env/altternative/python3.8 --cmd set pythonthreehome=/apollo

$ COMMAND_PID=7043
$ cat /proc/${COMMAND_PID}/cmdline | xargs -0 bash -c 'printf "%q " "$0" "$@"'

# Produces totally valid and usable command:
vim --cmd set\ pythonthreehome=/project/env/altternative/python3.8 /home/mdeguzis/.tmux.conf

[bruno-]

Thanks