[Feature] 希望Image图元能添加cellType=image时的keepAspectRatio属性

What problem does this feature solve?

目前定高定宽的Image图元会改变图片比例。
尝试使用外层定宽高的Group的clip裁切然后里面Image居中垂直对齐的方式会有奇怪的问题（添加display="flex" alignItems="center" justifyContent="center"才会出现，不添加不会出现问题），初次渲染没有图片，调用重新绘制的方法也无法显示，手动调整列宽或者快速上下滚动（应该是页面重新渲染了？）才会渲染出来，如下图。
另外开启clip似乎会把外层的Group的阴影属性穿透到内部的Text图元上。

What does the proposed API look like?

希望Image添加一个类似css中object-fit的属性，或者提供一个使用目前的图元实现类似效果的方法，感激。

Start by locating the Image implementation for cells with cellType=image, then review how fixed width and height currently affect image rendering. Compare the existing Group, clip, flex, alignment, and shadow behavior described in the report. Done should mean a documented API or equivalent behavior that preserves the image aspect ratio without the reported rendering and clipping regressions.