Add tests for row-span-full and col-span-full classes

[ben-rogerson]

This PR adds tests for the new col and row span classes in [email protected]. Further work isn't required as the updates come down the stream in the default config change from tailwindcss.

import tw from 'twin.macro'

tw`row-span-full`
tw`col-span-full`

// ↓ ↓ ↓ ↓ ↓ ↓

({
  "gridRow": "1 / -1"
});
({
  "gridColumn": "1 / -1"
});