Use valueFormatter

[jacques-lebourgeois]

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

From Apache Echarts 6 a valueFormatter has been added that should be used in place of formatter to format the value displayed in tooltip

Reduced test cases

https://stackblitz.com/edit/dsza8z1s?file=index.js

valueFormatter is not used

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Chrome

What version of ODS Charts are you using?

0.5.0