Allow overriding `Highchart.numberFormat`

This pull request changes usages of `numberFormat` function to `Highcharts.numberFormat`. This allows overriding `Highcharts.numberFormat` by clients.

The use-case for changing numberFormat function is to display non-latin digits (like arabic digits `٠١٢٣٤٥٦٧٨٩` or persian digits `۰‍۱۲۳۴۵۶۷۸۹‍‍`, instead of latin digits `0123456789`).

`ant lint` is executed on this change.