Successor PR for #1993, Introduces A plugin interface to define behaviours at...

Successor PR for #1993, Introduces A plugin interface to define behaviours at waypoint arrivals when using nav2_waypoint_follower (#2015)

* Add WaypointTaskExecutor plugin to main

Signed-off-by: jediofgever <fetulahatas1@gmail.com>

* couple result of task execution with stop_on_failure

Signed-off-by: jediofgever <fetulahatas1@gmail.com>

* add  failed ids to it's vector

* experimental change in nav2_waypoint_tester

Signed-off-by: jediofgever <fetulahatas1@gmail.com>

* remove unused code