[Feature] series-tree.label.borderWidth Support Array

[comtnt]

What problem does this feature solve?

Like padding, four directions can be set

What does the proposed API look like?

{
    borderWidth: [1,0,1,0]
}

[github-actions]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[github-actions]

This issue has been automatically closed because it did not have recent activity. If this remains to be a problem with the latest version of Apache ECharts, please open a new issue and link this to it. Thanks!