CalamineCellIterator always starts from row 0

[raptium]

python-calamine/src/types/sheet.rs

Line 252 in 2939a1c

position: 0,

Sheet.iter_rows() currently includes empty rows but excludes empty columns due to how CalamineCellIterator starts from position = 0. This inconsistent behavior is confusing—ideally, empty rows and columns should be treated the same way. Can this be made consistent, or clarified in documentation?