Support for Equal X-Y Axis Scaling

### Description

Hi, thanks for making this project open source, it's been very helpful!
I'm using ui-chart to plot x-y positions in meters and would like to keep the x and y axes equally scaled, similar to Matlab's `axis equal`. This is important for visual accuracy when displaying spatial data.
I know it's possible to manually set axis limits (min/max), but that doesn't enforce equal visual scaling, especially when the chart aspect ratio changes.
Is there a way to lock the aspect ratio so both axes scale equally? I couldn’t find anything in the docs or existing issues. I've attached an image showing the scaling problem.
Thanks again! Alberto.


### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate