[number field] option to apply number formatting as you type

# Feature request

## Summary

I would love an option to apply the the formatting as you type instead of just onBlur.

## Examples in other libraries

Material UI has an example when using `react-number-format` that does this: https://mui.com/material-ui/react-text-field/#integration-with-3rd-party-input-libraries

## Motivation

I love the MUI styled increment/decrement controls (and better browser standards support) of the example in the MUI docs (https://mui.com/material-ui/react-number-field/#outlined-field) but I really miss the injection of the thousands separators.