[Feature] xAxis.axisPointer.lineStyle：One supports a hight degree of customization requirements

[muyushifang07]

What problem does this feature solve?

xAxis.axisPointer.lineStyle.heght； I want to make the height of the line beyond the height of the charts, but I can't. I hope that echatrs can be supported to solve this problem.Thanks.

What does the proposed API look like?

xAxis.axisPointer.lineStyle.hight=200