Add libsdformat meta package for libsdformat >= 13

[traversaro]

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Issue

libsdformat was a real package until libsdformat 9, and then it has been substiuted by libsdformat10, libsdformat11, libsdformat12 . In some case it is useful to have a dependency on a generic version of sdformat, so it could be useful to have a libsdformat package on which to depend. If this works fine, we can extend it to other gz packages.

Installed packages

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Environment info

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