MediaLibrary: Add thumbnail generation API

Add an API to request asynchronous thumbnail generation from a media id.

The existing API (IMedia::requestThumbnail()) needs a Media instance. If the client only knows the media id, it must execute a SQL query to retrieve a Media, so for an UI client, this defeated the purpose of an asynchronous API.

This new API resolves the media id from the worker thread.

Refs #283 (closed)

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• 1695d462 - MediaLibrary: Add thumbnail generation API

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mentioned in commit rom1v/vlc@f70c0402

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mentioned in commit vlc@570e30eb

mentioned in commit bunjee/vlc@783a247c

mentioned in issue vlc#22687 (closed)