Add thumbnails to the diagram

[faxia]

What problem does this feature solve?

When I use the relational drawing network topology map, when the node number 5000 interaction is poor.
so, I hope echarts add thumbnails to the diagram

What does the proposed API look like?

series: {
    type:'graph',
    thumbnails: {
         x: 'xx',
         y: 'xxx',
         itemStyle:{},
        lineStyle:{}
    }
}

Demo as shown below:

[Ovilia]

Currently, we do not have such a feature. But I think this would be a nice feature to have.

[Ovilia]

Further discussion required before we decide whether to provide this new feature.

[faxia]

ok，I am looking forward to this feature.

[github-actions]

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