Number input styling

[paryhin]

Hey, the styling of this element looks off, and the arrows make it look like a dropdown component. We may want to use a regular input for now, or create a new component for this use case, something like:

[david-crespo]

We used to have this, more or less. Don't remember why I got rid of it, but it might be useful to whoever implements this to see how we did it. Or maybe not. We were using Styled Components, so you might turn to stone or your eyes might fall out of your head if you look at it.

#199
https://console-ui-sto-git-feature-174-increment-textfield-oxide-b9def3.vercel.app/?path=/story/components-forms-numberfield--with-state

#294
https://console-ui-storybook-git-number-field-alt-oxidecomputer.vercel.app/?path=/story/components-fields-number-field--with-state

[david-crespo]

MVP+1 because it's currently ugly but it works.

[david-crespo]

Done in #1582