Add support start a remote application under a debugger

Start the gdbserver on device and start gdb client locally in interactive
mode. Default port is not configurable as of now (1234) and other targets
(e.g. simulator, SDK) are not supported.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Reviewed-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D5299