it should be possible to set custom logic when resizing support iframe

[JLarky]

In fogbender package adaptIFrame function is called to change iframe size when window is resizing.

We already have disableFit option in renderIframe. So we might want to support that prop in fogbender-react or add a new one that can do custom resizing logic:

    const onResize = (el: HTMLIFrameElement) => {
      el.style.height = `${window.innerHeight - 60}px`;
    };

so to override resizing logic, we can simply add something like this in adaptIFrame:

    if (onResize) {
      return onResize(iFrame);
    }