Add camera_ros and v4l2_camera packages

[traversaro]

These packages use Linux-only dependencies, so we only add them on Linux.

xref: RoboStack/ros-humble#180

[traversaro]

libcamera is also released in the ROS build farm, but we want to use the conda-forge version so that one can install support for Rasperry Pi with libcamera-rpi, so we use the support added in RoboStack/vinca#78 .

[traversaro]

Error:   × Failed to resolve dependencies: Cannot solve the request because of: ros-
  │ kilted-libcamera * cannot be installed because there are no viable
  │ options:
  │ └─ ros-kilted-libcamera 0.5.0 would require
  │    └─ libcamera >=0.5.0,<0.6.0a0, for which no candidates were found.
  │ 
  ╰─▶ Cannot solve the request because of: ros-kilted-libcamera * cannot be
      installed because there are no viable options:
      └─ ros-kilted-libcamera 0.5.0 would require
         └─ libcamera >=0.5.0,<0.6.0a0, for which no candidates were found.

I guess we need to update conda-forge's libcamera to 0.5.0

[traversaro]

I guess we need to update conda-forge's libcamera to 0.5.0

See conda-forge/libcamera-feedstock#7 .

[traversaro]

conda-forge/libcamera-feedstock#7 was merged, this PR is now ready for review, @wolfv @elephantum feel free to review, thanks!

[traversaro]

By the way, apparently there is a bug that prevents post-PR CI to actually build all the packages that should be built (see #28). That means that we can avoid to bump the build number for libcamera in this PR.

[elephantum]

This stuff with virtual packages is a bit beyond my comprehension, but I'm happy to test as soon as it will be merged!

[traversaro]

Great, thanks! Then let's try to get this actually built.