[Textarea][Joy] Add Textarea component

[siriwatknp]

Preview: https://deploy-preview-33975--material-ui.netlify.app/joy-ui/react-textarea/

Motivation

Even though input and textarea are quite similar but their props and default styles are different.

I don't think combining them like this is a good thing:

<TextField /> // renders <Input />
<TextField multiline /> // renders <Textarea />

This PR split the Textarea into its own component which removes the typescript headache and makes the component easier to reason about (closer to the native html).

In the next PR, it will be TextareaField which combines Textarea, FormLabel and FormHelperText.

The supported props and structure are consistent with the Input.

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• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

Details of bundle changes

@mui/joy: parsed: +3.62% , gzip: +3.04%

Generated by 🚫 dangerJS against 90ae674

[danilo-leal]

Looks awesome! Just pushed very minor tweaks but other than that, it's great!