[FEAT REQ] `react-tooltip__show` class counterpart for closing the tooltip

[gabrieljablonski]

It is not currently possible to use a "closing transition" for the tooltip, similar to the fade in when it opens.
Adding a react-tooltip__closing class (which requires some logic changes, since the tooltip currently closes immediately) should allow for using customizing the closing transition as well.

[gabrieljablonski]

#1106 should be merged soon with support for the fade-out transition.

@victorpavlenko Feel free to test it out with the beta version react-tooltip@5.22.0-beta.1106.0.

It is enabled by default, and the delay (0.15s default) can be changed by overriding the CSS variable --rt-transition-closing-delay (--rt-transition-show-delay is also available).

[gabrieljablonski]

Since react-tooltip@5.22.0, the tooltip has a fade-out transition by default. See docs for more details.