Implement `toggle_css_class` action

[marcoroth]

Action signature:

turbo_stream.toggle_css_class(targets, classes, **attributes)

Example Turbo Stream Element:

<turbo-stream action="toggle_css_class" targets=".items" classes="background-blue background-gray"></turbo-stream>

Action content:

target.classList.toggle(...classes)

Reference:

• https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/toggle