Support for different selectors and/or multiple selectors

[nimi]

Hi @maslianok!

Thanks for the very cool lib!

Right now this library only supports adding a resize detector on a parent element or a resizableElementId. It would be nice if this were a bit more flexible and it would allow both a way to provide a selector that is not only just id (for example using querySelector) and allow for more than one selector to be added and I can listen to resize events on multiple elements. Thoughts?

[maslianok]

@nimi
v4 introduces querySelector props

[nimi]

Awesome. Thanks @maslianok