Support JSX classname (without calling classNames())

[fsubal]

💡 Idea

// Currently supported
<div className={classNames('a', 'b')} />
<div className={classNames('a')} />

// Should be supported
<div className="a" />

// Out of scope
<div className="a b" />

[fsubal]

It can interfere gradual adoption of tailwind ( For example, some part of codebase is written in tailwind, but others are not ).

Maybe it's better to enforce to always wrap with classNames(), if it is intended to be a tailwind classname ( That's more explicit ).