[Experiment] Use `OffscreenCanvas` to cache cell renderer results

[bennyboer]

Cell renderers that need heavy calculating to produce a result take a while and slow down rendering of the table.
We could try to use an OffscreenCanvas (per cell or only for cells that use cell renderers that need it) to rerender when the appearance of a cell changes, but otherwise just copy the cached image from the OffscreenCanvas.

• Check memory and performance impact of using an OffscreenCanvas per visible cell in the viewport