[meter] Support `<meter>` element's high/low/optimum attributes

Split from https://github.com/mui/base-ui/pull/743

The HTML `` element is able to segment the range into high/medium/low segments and indicate which "pole" is optimum for sighted users, but there's no ARIA equivalent.

The native functionality of HTML meter which uses `high` `low` and `optimum` attributes have poor browser support: https://www.htmhell.dev/adventcalendar/2022/5/

One way the Meter component could support this is by providing this in `aria-valuetext` as suggested in https://github.com/w3c/aria/issues/451#issuecomment-252804380

This is expected to be considered for ARIA 1.3/1.4: https://github.com/w3c/aria/issues/1336