Visualise the different between initial and final structure in the result panel if structure changed.

Converted from https://github.com/aiidalab/aiidalab-qe/issues/418#issuecomment-1601104571 mentioned by @AndresOrtegaGuerrero

Once you do a geometry optimization, it could be useful to show in the results the initial structure (with different coloring) vs final optimized, it could by overlapping?. Her comment is that there should be a way to do the visual comparison.