Deprecate left_wrist_mk2 and left_hand_mk3 and remove them in next release?

[traversaro]

As mentioned in https://github.com/robotology/gazebo-yarp-plugins/pull/620#issuecomment-1087309756, it seems that left_hand_mk3 model is now obsolete, so I think we can deprecate it and eventually remove it. If that is the case, I guess that also left_wrist_mk2 is deprecated?

fyi @randaz81 @xEnVrE @ale-git @pattacini @gabrielecaddeo @fiorisi @mfussi66

[traversaro]

Per f2f discussion with @pattacini and @fiorisi, the wrist will remain mk2, but the standalone model left_wrist_mk2 can probably be deprecated/removed as well.