Add heatmaps/lasagna plots

[beasteers]

🌈Feature request

What is this feature? There are a lot of really great things that I've been looking for in a react plotting library (shoutout to brushes and event charts !!)

A useful feature would be heatmaps that show multivariate time series where each variable is a row and a variable's magnitude is denoted through color.

How should the feature work? It should take in a 2d array and draw an even (or maybe uneven could be a good option too) grid of rectangles where the color is attached to some value scale.

The two features that I'm not sure that react-ts-charts has are

1. a categorical axis (for example, if you have 5 sensors, and you want to show their uptime coverage over time, displaying each sensor as a row), and
2. color scales + a color bar

Do you have examples or an idea of how it can be implemented? Here's a d3 example which shows a basic way of making a heatmap. I'm sure it won't be much different with react+svg https://www.d3-graph-gallery.com/graph/heatmap_basic.html

Additional context (Add any other context or screenshots about the feature request here)

I'm mostly interested in the first and third plots which are the easiest to deal with

Spectrogram reference

Here's an example of an audio spectrogram. The y axis has a linear scale

Categorical heatmap reference

Here's an example with a categorical scale

The principal is the same, but they differ in labeling

Update: they are also called lasagna plots