Patch for PhotoAtWaypoint plugin (#2067)

* nav2_way_point_follower; introduce photo at waypoint arrivals plugin

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

* resolve cmake lint errors

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

* resolve requested chages of first review

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

* minor corrections on photo_at_waypoint header

* resolve requested changes of second review

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

* update default save_dir

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

* move directory checking code to initialize()

* add try catch block to catch possible execeptions while creating a directory for photo at waypoint plugin

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

* adding logging and disabling

* Update nav2_waypoint_follower/plugins/photo_at_waypoint.cpp

Co-authored-by: Fetullah Atas <fetulahatas1@gmail.com>

* Update photo_at_waypoint.cpp

Co-authored-by: jediofgever <fetulahatas1@gmail.com>