feat: support initial transform

[mainhanu]

what

Support initialTransform options, used to restore the value returned by the transform event

why not use initialX initialY initialZoom

1. initialX initialY initialZoom is not corresponding to the value returned by the transform event, we need complicated conversion to match initial values with transform result . my old resolution is to combine initialZoom and moveTo，which is ugly
2. initialX initialY initialZoom will cause an extra transform