allow plotly.js to accept numpy buffers

If we allowed all GL plot types to accept numpy buffers for plot x/y/z data, then the Python library could optionally avoid JSON serialization of array data, like @maartenbreddels does in his brillant project ipyvolume:

https://github.com/maartenbreddels/ipyvolume/blob/master/ipyvolume/serialize.py#L95

Here is the deserialization on the JS side:

https://github.com/maartenbreddels/ipyvolume/blob/master/js/src/serialize.js#L16

Plotly.js has all of these incredible WebGL figures for scientific computing, but their potential in Python, R, MATLAB, etc is limited by the JSON serialization step.

In a similar vein, it seems like all GL types should be able to accept Float32Array's directly instead of untyped JS arrays. Currently, it looks like only the Plotly trace type pointcloud accepts Float32Array's:

https://codepen.io/plotly/pen/GEoPgv

Comienza comparando las implementaciones referenciadas de ipyvolume serialize.py y js/src/serialize.js; después, inspecciona el manejo existente de Float32Array de pointcloud en Plotly.js y los puntos de entrada de los trazados GL. El issue no menciona archivos ni pruebas de Plotly.js; para darlo por terminado sería necesario acordar el alcance de los trazados GL compatibles, la deserialización de buffers y verificar que los datos de los arrays eviten la serialización JSON.