meson: fix naming/version/path of the .egg-info file
meson: fix naming/version/path of the .egg-info file

Match what we do with distutils

* Use "PyGObject" as package name (it's not case sensitive, but no need to
  diverge there)
* Mark unstable releases as dev releases by adjusting the version number
* Install in the right directory (not the gi package)

GNOME/pygobject,pexip/pygobject,pexip/pygobject,GNOME/pygobject,pexip/pygobject,GNOME/pygobject