Add `image` Type of Trace

For [MATLAB](https://plotly.com/matlab/imshow/), [Python](https://plotly.com/python/imshow/) and [JS](https://plotly.com/javascript/reference/image/#image) there is a support for the `image` type of trace.

It would be great to have it in Julia as well.

By the way, please make it support `AbstractArrays` and not only the image type from Julia Images.

By the way, there is some reference for [Julia](https://plotly.com/julia/reference/image/) as well, but not in the official documentation.