add support for hover_data keyword argument in plotly.express.imshow

Hello! This is a feature request to add support for the hover_data keyword in the plotly.express.imshow function. It's implemented for other express function like line and scatter.

Using plotly 4.9.0

I'd like to be able to format of the value displayed on hover and add new data to be displayed.

Thanks!

从 plotly.express.imshow 入口开始，比较其他 Express 函数（尤其是 line 和 scatter）处理 hover_data 的方式。跟踪链接的 hover-text 文档，了解预期行为。完成的标准是 imshow 接受 hover_data，支持格式化现有的 hover 值，并在 hover 时显示额外数据。