Heatmap for timing and other data

[Alizter]

We have various bits of information available to the user via hover such as timing, memory usage, universe count etc.

It would be useful if the VSCode extension had a way of visualizing this data using a heatmap.

Here are some examples of extensions with heatmap functionality:

• https://github.com/SalmonMode/activity-heatmap
• https://github.com/chrisjdavies/vscode-heatmap