`warn` and `warnText` for `TextArea` component

[Addeuz]

This is maybe more of a feature request than an issue.

But why isn't the warn and warnText props available on a TextArea? I'm talking about the props that are available on the TextInput component. Since invalid and invalidText is I think it would be nice to have..

Is there a reason for it? Saw on the react components library that the TextArea there didn't have it either...

[metonym]

Thanks for requesting this in carbon-design-system/carbon#10910

There is also a PR for Svelte pending upstream CSS support: #978