[I] [Feature] Bar charts: add more options for emphasis focus [echarts]

["rooney (via GitHub)" <gi...@apache.org>]

rooney opened a new issue, #20723:
URL: https://github.com/apache/echarts/issues/20723

   ### What problem does this feature solve?
   
   On stacked bar charts, sometimes I need to emphasize the hovered stack (not just 'self'), e.g:
   
   <img width="378" alt="Image" src="https://github.com/user-attachments/assets/e193bb91-866b-4244-873e-981e8eaac708" />
   
   --
   And its series-equivalent:
   
   <img width="374" alt="Image" src="https://github.com/user-attachments/assets/4c01cef7-5d8c-48ae-bd08-ee030d804e56" />
   
   --
   And optionally (for completeness sake) everything in the hovered dataIndex:
   
   <img width="373" alt="Image" src="https://github.com/user-attachments/assets/ecdc70f8-c903-47ca-8227-b89b8f922b43" />
   
   
   ### What does the proposed API look like?
   
   `{ emphasis: { focus: 'stack' | 'stackSeries' | 'dataIndex' } }`


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