Remove conversion of Matplotlib artifacts to Plotly objects for storage

When a Matplotlib figure is stored as an artifact to the Simvue server, it is converted to a Plotly artifact and stored that way (I assume so that it can be viewed within the UI, which is very useful!). However when it is pulled back from the server using the client, the figure is returned as a Plotly object, instead of the Matplotlib figure originally stored. Can the figure be converted back to Matplotlib before being returned, so that the user gets back the same artifact which they stored?

Empieza por la ruta del cliente que recupera los artefactos almacenados y sigue cómo se serializan y reconstruyen las figuras de Matplotlib. Comprueba el manejo existente de Matplotlib a Plotly descrito en el issue y añade cobertura específica de round-trip. Se considera terminado cuando una figura de Matplotlib almacenada en Simvue se devuelve como una figura de Matplotlib, mientras que la recuperación de artefactos de Plotly existentes sigue funcionando.