Vertical line (extraLinesData) in Barchart

The VerticalLine configuration inside extraLinesData does not render on a BarChart. In contrast, HorizontalLine works as expected. This leads to confusion, as there is no indication in the documentation that VerticalLine is unsupported for BarChart.

Start at the BarChart handling of extraLinesData and compare it with the HorizontalLine path, using the VerticalLine configuration described in the issue. Reproduce the case in a BarChart example or test and confirm that the expected result is either a rendered vertical line or an explicit documentation statement that it is unsupported.

Written by the indexing model from the issue text.