[number field] Implement `inputmode` for mobile keyboard support

[mj12albert]

Raised in https://github.com/mui/material-ui/pull/36119#issuecomment-1678269343

The inputmode attribute hints to browsers for devices with software keyboards to determine which keyboard to provide when an input is focused. It should be returned by getInputProps().

References

• https://css-tricks.com/everything-you-ever-wanted-to-know-about-inputmode/
• https://react-spectrum.adobe.com/blog/how-we-internationalized-our-numberfield.html#mobile

[mj12albert]

Manually test/benchmark first, we need to make sure the - and . characters are available

[michaldudak]

This is supported by the new NumberField component.