lua: playlist: add a way to change playlist meta

Expose a way to change playlist metadata in Lua. For now add a specific call to the vlc interface only available in the parse function, it should be used that way:

function parse()
-- This is the usual "meta" Table also used on returned items.
vlc.set_current_playlist_meta({
title="Podcast title",
arturl="https://artworkuri.jpg",
})

-- ...
end

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mentioned in merge request !3020 (closed)

An ambient setter doesn't look like it fits the current API, TBH. The ambience is the input stream currently, nothing to do with the output/results.

added MRStatus::InReview label

added Component:: Metadata label

changed milestone to %4.0

added MRStatus::NotCompliant label and removed MRStatus::InReview label