"visually" test on ee.Image

[fitoprincipe]

Is your feature request related to a problem? Please describe.
Some processing done in GEE side are better checked by "seeing" the image, e.g. smoothing filters, convolutions and many others. Would be like saying that a bunch of pixels have always the same values, but also being able to see the results is a plus.

Describe the solution you'd like
data_regression plugin being able to store the image and check against it. It could benefit from the new ee.data.getPixels or computePixels methods

Additional context
Test should be performed over small areas. Maybe the plugin could do some checking on this, or at least warn the user if the fetching is too large.