examples: Add UWP example

Takes an example code from https://gitlab.freedesktop.org/seungha.yang/gst-uwp-example
and a dll tool implemented by Nirbheek Chauhan <nirbheek@centricular.com>
https://gitlab.freedesktop.org/nirbheek/gst-dll-tools
6 jobs for !2668 with uwp-example in 59 seconds
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