The getViewXml function depends on high-level APIs (Codec, TemporaryCellStates) and is only used by the Editor class.
Moving it to a dedicated xmlViewUtils module improves separation of concerns:
  - xmlUtils remains focused on low-level XML parsing utilities
  - xmlViewUtils handles view-specific XML serialization

BREAKING CHANGE: xmlUtils.getViewXml moved to xmlViewUtils.getViewXml.