[I] [Feature] The tooltip arrow should show when the property "confine" is set to true or "position" is a function [echarts]

[via GitHub]

jgoncab-arte opened a new issue, #19948:
URL: https://github.com/apache/echarts/issues/19948

   ### What problem does this feature solve?
   
   When the property `tooltip.confine` is set to true the tooltip arrow is not 
shown. I think it would be good if the arrow adapted according to the position 
of the tooltip and the coordiantes to point to. Something like this:
   
![image](https://github.com/apache/echarts/assets/169657500/c7a55528-43cb-497f-9798-4f7869083b60)
   Also happens when tooltip.position is a function no matter what value it 
returns. At least when it returns a string like "top" the arrow should display, 
but I would display it in all cases.
   
   ### What does the proposed API look like?
   
   Probably the API should not change and simply work this way always. Maybe it 
can be something like this if you think that is necessary to keep the previous 
behavior:
   ```
   tooltip: {
       arrow: {
           show: "always"|"onlyCentered"
       }
   }
   ```


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