qmlformat: Sort import statements too

qmlformat --normalize currently sorts properties, functions, etc. alphabetically but it doesn't sort import statements. (This contradicts the documentation at https://doc.qt.io/qt-6/qtquick-tools-and-utilities.html#qmlformat , with or without --normalize; see QTBUG-107213)

Suggestion

Sort import statements alphabetically by URI too.

Extended suggestion

A customer expressed interest in being able to group "native" Qt imports separately from custom project imports. A toggleable option to sort by absolute module path could help here?