fix(yt_dlp/post_processors): Register in python

We need to tell yt_dlp about our post processors, as they would
otherwise not take full effect. For example, changing the title would
previously only have changed the title in the *in-memory* info json, the
actual file on disk (video and .info.json) would still have the old
title, as yt_dlp did not know about our post processor.

Registering it via their api also has the upside of being able to
determine when to run.

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