Handle VideoSecondaryInfo's attributedDescription prop

[LuanRT]

Describe your suggestion

YouTube has been A/B testing this for a while but now it seems more frequent. When a particular session is affected, a property called attributedDescription takes description's place (which is why description returns “N/A”). To fix that, we should add some logic to convert the attributed description's commandRuns to regular text runs. This way, it will be easier to parse and add support for things such as attachmentRuns. With that, we'll also get to keep the property named “description” as the data structure will remain the same.

Other details

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Checklist

• I am running the latest version.
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