facet-rs / facet / 19926359739

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feat(facet-value): add extensible Other type with VQName and VUuid

Implements issue #1038: Extensible 'Other' type for facet-value.

This adds an extensible type system using the reserved tag 7 slot:
- OtherKind enum with secondary discriminant on the heap (u8)
- VQName: qualified name (namespace + local name) for XML support
- VUuid: 128-bit UUID for semantic identity preservation

Changes:
- Add TypeTag::Other = 7 to value.rs
- Add ValueType::QName and ValueType::Uuid
- Add DynValueKind::QName and DynValueKind::Uuid to facet-core
- Add is_qname, is_uuid, as_qname, as_uuid methods to Value
- Update Clone, Drop, PartialEq, PartialOrd, Hash, Debug for new types
- Update Destructured enums for pattern matching
- Update facet-pretty, facet-assert, facet-diff for new kinds

This preserves performance for common types while enabling unlimited
future extensibility via the OtherKind discriminant.

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