[Feature] add emphasis config for all relative data

[ksbaozi]

What problem does this feature solve?

Currently, the focus adjacency in the emphasis can only highlight single-level data nodes.
I hope to achieve highlighting of its ancestor and descendant nodes simultaneously, and I wish there could be such a configuration.
example:
current：A->B->C->D->E，when i hover C only B & D will be highlight
what i want：when i hover C ABCDE will all be highlight

What does the proposed API look like?

emphasis: {
      focus: 'xxxx',
    },