readDocxMetadata function
Reads only the metadata from a DOCX package.
The required word/document.xml part is still validated so callers do
not accidentally accept a random ZIP containing a core-properties file.
Implementation
BookMetadata readDocxMetadata(final Uint8List bytes) {
final package = _DocxPackage.fromBytes(bytes);
return _readDocxCoreMetadata(package.coreProperties);
}