Allow vertically resizing Textarea

[spruce]

What does it do?

Changed the height attribute to min-height and allowed the textarea to be resized.

Why is it needed?

As described in https://github.com/strapi/design-system/issues/1916 it would be nice to resize Textareas for better editing. In a later PR it would be nice to add the ability to specify another min-height's for each textarea input

How to test it?

Create a new multiline text input in any entity and then go to the content view of that entity and see that the textarea is resizeable

Related issue(s)/PR(s)

Fixes #1916