Streaming or sequence widget

[martinal]

A loosely defined idea for now, to be expanded on later. Many variations can be imagined, some specific use cases would be needed to elaborate on details.

This widget would represent a sequence of data widgets, but could present itself as a single data widget to an external widget that uses it. The idea is to store (cache) a number of snapshots among which the current one can be selected by a time variable.

Setting time between snapshot times could optionally lead to interpolation between data widget arrays.

Implementing this widget well could solve playback and replay of time series with minimal effort in libraries using ipydatawidgets.