JIT: Add exhaustive pseudo-class and pseudo-element variant support

[adamwathan]

This PR adds support for the following new variants to the JIT engine:

• first-letter
• first-line
• marker
• selection
• only (only-child)
• first-of-type
• last-of-type
• only-of-type
• target
• default
• indeterminate
• placeholder-shown
• autofill
• required
• valid
• invalid
• in-range
• out-of-range

I've left out a few pseudo-classes that either have very poor or non-existent browser support, or just don't seem useful because of how Tailwind works. If we're missing anything anyone actually needs though happy to add support since there isn't really any cost.

[surjithctly]

Please add support for :not and ~

 :not(:placeholder-shown):invalid ~ .feedback {
…
}

Use case: Form Validation.
Demo: https://tailwindcomponents.com/component/contact-form-popup-widget

Thank you: