naver / billboard.js / 34571609169

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feat(resize): add resize.live to follow the container while resizing

resize.timer delays the redraw, so the chart kept its previous pixel size
while the container was being dragged. resize.live follows it in between.

How the size is followed is measured, not configured. While a resize redraw
fits in one animation frame(16ms) the chart is redrawn every frame; once a
redraw misses that budget the rendering is stretched to the new size for the
rest of the resize and redrawn when it settles. The switch only goes one way
within a resize, so frames can't alternate between exact and stretched, and
the measured time outlives the resize so an expensive chart stretches from
the first frame of the next one.

Stretching writes the viewBox and the width/height attributes for SVG, and
the CSS box alone for canvas, leaving the backing store as is. Pointer
coordinates keep working through the existing hasViewBox() branches.

Close #4219

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