[Bug 783798] utils: Add a function to get a string representation of GstStateChange

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783798

--- Comment #12 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 353843
  --> https://bugzilla.gnome.org/attachment.cgi?id=353843&action=edit
Handle newly added GstStateChange values

The GstStateChange should not be concidered 'closed' and new values
can be added to it, thuse a `default:` handler should be added.

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