Wayfinding practice worlds

[caguero]

Similar to #582 but for the wayfinding practice worlds.

How to test it?

Follow instructions from #582 but launch the worlds with:

ros2 launch vrx_gz competition.launch.py world:=practice_2022_wayfinding0_task
ros2 launch vrx_gz competition.launch.py world:=practice_2022_wayfinding1_task
ros2 launch vrx_gz competition.launch.py world:=practice_2022_wayfinding2_task

[caguero]

@M1chaelM , the environmental conditions have been updated. This PR is ready for review.

[M1chaelM]

@caguero It looks like the waypoint markers aren't enabled. To you want to merge #582 first?

[M1chaelM]

@caguero Looks like we are using exactly the same waypoints for worlds 0 and 2. I'm guessing this is a copy error?

[M1chaelM]

Looks almost ready to go--can we use different waypoints for practice worlds 0 and 2?

[caguero]

@caguero Looks like we are using exactly the same waypoints for worlds 0 and 2. I'm guessing this is a copy error?

Good catch, I just updated the waypoints of world 2.