Introduce how to use unofficial ros_gz combinations for Garden/Humble

[j-rivero]

The PR adds some documentation to the ROS installation document to cover the new option of the so-called "Unofficial wrappers" binary packages for the Garden/Humble combination. Two main parts in the changes:

1. Explain the option of using non ROS official packages together with the build from source and the cons of using them.
2. Modify the Garden/Humble instructions to cover this new option.

[azeey]

I'd also suggest we drop the "unofficial" part. I'm not sure what that buys us.

[j-rivero]

Does "official" mean the packages on packages.ros.org, and "non-official" means the packages on packages.osrfoundation.org? Somewhere in here, it should directly say what these terms mean.

This is correct, but "unofficial" also means that these packages are out of the official ROS maintenance for packages (out of the buildfarm) which have some implications: packages are not automatically rebuild when dependencies change (implicit risk of ABI breakages), releases are not in sync with the sources ,etc.

I'd also suggest we drop the "unofficial" part. I'm not sure what that buys us.

Same than above, not the usual ROS maintenance/building features that someone expects from ROS packages.

[j-rivero]

Thanks for the reviews. I change the pointers to osrfoundation.org by the repository name and all the "unofficial" words that I found to use "non official".

[quarkytale]

Would using "unsupported" or the likes of it, serve better than the official/unofficial phrase?

[j-rivero]

Would using "unsupported" or the likes of it, serve better than the official/unofficial phrase?

Umm, may help to understand that the packages are not typical maintained ROS packages but I assume that we want to provide support on fixing, debugging and updating these packages so it might drive to a confusion.

[j-rivero]

@kscottz could you please give a quick look so we all are good with the final changes?