Announce addon version number on load

IMHO when booting FreeCAD this is useful to see `Assembly4 workbench (v0.11.10) loaded`
I think we should make this standard for
```
$ freecad-ppd.freecad
FreeCAD 0.20, Libs: 0.20R28186 (Git)
© Juergen Riegel, Werner Mayer, Yorik van Havre and others 2001-2022
FreeCAD is free and open-source software licensed under the terms of LGPL2+ license.
FreeCAD wouldn't be possible without FreeCAD community.
##### #### ### ####
# # # # # #
# ## #### #### # # # # #
#### # # # # # # # ##### # #
# # #### #### # # # # #
# # # # # # # # # ## ## ##
# # #### #### ### # # #### ## ## ##

Assembly4 workbench (v0.11.10) loaded
Sheet Metal workbench loaded
```

Looks liks @zolko123 leverages metadata ?
https://github.com/Zolko-123/FreeCAD_Assembly4/blob/b57a811eefc21c9d751746703af41f1356d70087/Init.py#L49