Refactor schema slots across multiple classes to improve consistency and clarity
- Removed unused slots from TaxonomicAuthority, TechnicalFeature, TelevisionArchive, TentativeWorldHeritageSite, Threat, TimeSpan, Title, TradeRegister, TradeUnionArchive, TradeUnionArchiveRecordSetType, TransferEvent, UNESCODomain, UnitIdentifier, UniversityArchive, UnspecifiedType, UserCommunity, Venue, Vereinsarchiv, Verlagsarchiv, VerlagsarchivRecordSetType, Version, Verwaltungsarchiv, VideoAnnotationTypes, VideoAudioAnnotation, VideoFrame, VideoPost, VideoSubtitle, VideoTextContent, Warehouse, WebArchive, WebClaim, WebClaimsBlock, WebLink, WebPortal, WebPortalTypes, WomensArchives, WordCount, WorldHeritageSite, WritingSystem, and XPathScore.
- Introduced new slot is_or_was_retrieved_at for tracking data retrieval timestamps.
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