Support JIT engine changes and new features

[Muhammad Sammy]

https://tailwindcss.com/docs/just-in-time-mode#new-features

Can be enabled with mode: 'jit'

Supported:

• JIT: All variants are enabled.
• JIT: Built-in important modifier e.g. font-bold !font-medium, sm:hover:!tw-font-bold
• JIT: Add universal shorthand color opacity syntax (#239)
• JIT: Add per-side border color utilities (#238)
• JIT: Add support for before and after pseudo-element variants and content utilities (#237)
• JIT: Add exhaustive pseudo-class and pseudo-element variant support (#236)
• JIT: Add new peer-* variants for styling based on sibling state (#233)
• JIT: Add caret-color utilities (#235)
• JIT: Remove need for transform class when using classes like scale-*, rotate-*, etc. (#232)
• JIT: Remove need for filter and backdrop-filter classes when using classes like contrast-*,

won't support:

• Arbitrary values e.g. w-[762px] h-[918px]
• All variants can be stacked together e.g. md:dark:disabled:focus:hover:bg-gray-400 (#206)