macosx: React to more media library change events

Previously, we would only listen to VLCMediaLibraryMediaItem related events in our macOS code.

This PR adds handling of artist, album, and genre events too

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added 20 commits

• 84c29133...59f88ce8 - 19 commits from branch videolan:master
• 58801131 - macosx: React to more media library changes

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enabled an automatic merge when the pipeline for 58801131 succeeds

merged

added Component::Interface: macOS Platform::macOS labels

changed milestone to %4.0