[PR] feat(barRange): support custom value formatter [echarts-custom-series]

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

ekatrif opened a new pull request, #33:
URL: https://github.com/apache/echarts-custom-series/pull/33

   ## Description
   
   Add support for custom formatting of the values displayed at the top and bottom of the `barRange` series.
   
   Currently, `barRange` always appends the Celsius degree symbol (`℃`) to both values, which limits the series to temperature data represented in Celsius.
   
   This change introduces an optional `valueFormatter` in `itemPayload`.
   
   ### Usage
   
   ```js
   itemPayload: {
       valueFormatter: value => `${value} °F`,
   }
   ```
   
   ### Backward compatibility
   
   If valueFormatter is not provided, the existing behavior is preserved:
   
   ```js
   10℃
   20℃
   ```
   
   ## Screenshots
   <img width="2058" height="836" alt="SCR-20260817-jsvt" src="https://github.com/user-attachments/assets/7b1afd4f-88e6-45f1-a2a2-0d5a43937758" />
   
   
   <img width="1011" height="411" alt="image" src="https://github.com/user-attachments/assets/703285c3-b426-428d-a727-d50551d92cf9" />
   


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