add a `validate=False` option for `graph_objects` and `px` figures

There's already an issue outlining the effects graph_object validation has on plot generation time. Users can bypass this performance hit by replacing the graph_objects with dict and then display the plot with plotly.offline.iplot(fig, validate=False) or if they are creating graphs in Dash, they can forgo the plotly.py library altogether and just use a dict in their Graph component's figure argument.

This solution can greatly improve the performance of Dash apps but it means that Dash users with expensive graphs have to choose between using px/plotly.py's update methods and optimally fast code.

I wonder if a way to turn off validation, especially in Dash apps, would help Dash users get the best of both worlds.

cc @matthewchan15

Revisa el issue #1052 y las rutas existentes de generación de figuras de graph_objects y px; después, sigue cómo se aplica la validación antes de offline.iplot y de los consumidores de figuras relacionados. Define cómo debería funcionar una opción validate=False en estas APIs, incluido el caso de uso de Dash, y verifica que deshabilitar la validación mejore la ruta objetivo sin cambiar el comportamiento normal con validación.