[textarea] Implement TextArea component

[colmtuite]

The primary motivation here is to reduce the amount of render props required in forms. We'll also handle auto-resizing.

To consider:

• https://github.com/mui/material-ui/issues/43719

Search keywords:

[martenbjork]

Feature request: Support minHeight in px as well as minRows. This is a popular feature request in the react-textarea-autosize library: https://github.com/Andarist/react-textarea-autosize/issues/314

[mj12albert]

• Does it need to support rendering as <div contenteditable/>? I think it's not compatible with the constraint validation API though
• How about an (optional) character count part or is that out of scope for textarea
• Work on CSS field-sizing has begun in Firefox and already shipped in Safari Technology Preview
• Should it do anything about the (default) scrollbars, or leave it to the user to use it together with ScrollArea

[observstream]

Any update on when this will be available?

[Jacksonmills]

I can be assigned to this one if possible!