Allow Setting Rows, Columns, and Spellcheck in Textarea Component

[Sapein]

Currently you are unable to set the Rows, Columns, and Spellcheck attributes directly on the Textarea component, as attempting to do so actually applies it to the top-level span. This prevents users from being able to enable/disable Spellcheck on a Text Area, along with preventing users from being able to set the appropriate size of the Textarea.

I'm not really sure the best way to do this, although I am more than willing to open up a PR to add this if that's all right.