Is your feature request related to a problem? Please describe.

When using onBrushEnd with a chart, brushing only happens along the x-axis.

Describe the solution you'd like

I'd like to allow brushing along the y-axis instead of the x-axis. (Perhaps also both, with a rectangular selection, but this is not needed for my use case.)

Kibana Cross Issues

Work using this is happening in elastic/kibana#59496.

Checklist

• this request is checked against already exist requests
• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present