[I] [Feature] Configurable priority level for displaying X axis labels [echarts]

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

oliwheeler opened a new issue, #21181:
URL: https://github.com/apache/echarts/issues/21181

   ### What problem does this feature solve?
   
   In some charts, certain labels, e.g the start of the year or month should be prioritized to show over others.
   
   <img width="708" height="239" alt="Image" src="https://github.com/user-attachments/assets/35317847-c418-444f-a8ab-356c71c9abd7" />
   
   
   
   ### What does the proposed API look like?
   
   `xAxis.axisLabel.interval` : `(index:number, value: string) => number`
   
   The higher the number, the higher the priority to show over lower priority ones when `hideOverlap: true`.
   e.g.
   
   ```ts
   const options = {
      xAxis: {
       type: "category",
       interval: (index, value) => {
         if (firstDayOfYear(value))  {
           return 2
         }
         if (firstDayOfMonth(value)) {
           return 1
         }
         return 0
       },
     }
     ...
   }
   ```


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