Draft: tracker-miner-fs: Setup GStreamer around tracker-extract-3 restarts
Call gst_init() and gst_deinit() around tracker-extract-3 restarts. This will handle situations where people update related packages (and invalidate the GStreamer registry) without going through a session or miner restart.
Sadly, the memory payload will still belong in tracker-miner-fs-3 (e.g. more than 300KB of interned strings, between others).