Ternary plot missing `automargin` option in `layout.ternary`

Currently the Ternary plot: https://plotly.com/javascript/ternary-plots/
doesn't have automargin option in each axis in the layout.ternary: https://plotly.com/javascript/reference/layout/ternary/

Therefore, it may happen that the title of the axis is cropped, not only in the case of long titles, but more often due to smaller screen sizes (or figure sizes).

This is more likely for the title text in axes B and C located in the bottom being cropped, e.g.:

Titles are being cropped!

Demo example: https://codepen.io/Lexachoc/pen/MYgVGoW

The title in axis B has no margin to adjust the position and is therefore cropped.

It would be very helpful to add this option (or a similar one to achieve the same thing, avoiding the title text being cropped) to the ternary plot.

从 layout.ternary 参考和链接的 ternary plot 示例开始，然后跟踪轴标题和边距的处理方式。当 ternary 轴提供 automargin 选项或等效行为，并且标题（尤其是轴 B 和 C 上的标题）在小图中不再被裁剪时，工作就完成了。