analytics: Implement bindings for the new analytics library
Implements new bindings.
The analytics library have a set of sub-types that the are stored in the Meta. I've implemented them as extra traits that the Ref to the meta can implement. In theory, we should be able to implement a new subtype in an external library/application.
Depends on !1365 (merged), which I've included in this branch. And on gir-files-rs!57 (merged) which adds the GstAnalytics-1.0.gir to the repo
Edited by Olivier Crête