[BUG]: scattergl hover is slow above 100k points #8134

Description

With 100,000 or more points, hovering over a scattergl trace is much slower than with 99,999 points.

Steps to reproduce

• Open Plotly devtools and paste the following into the browser devtools console:

let n = 100000;

Plotly.newPlot('graph', [{
  type: 'scattergl',
  mode: 'markers',
  x0: 0,
  dx: 1,
  y: Array(n).fill(0)
}]);

• Hover over individual points and note the lag
• Change n to 99999 and note that hover is fast

Notes

• At TOO_MANY_POINTS (src/traces/scattergl/constants.ts), scattergl switches from a plain array to the point-cluster tree
• The slow call is .range() in src/traces/scattergl/hover.js
• It's very slow with infinite bounds; it also seems slower than a plain array scan when the bounds cover a large share of the points
• Either hover.js calls .range() in a non-optimal way, or plotly/point-cluster has a performance bug
• Fix scattergl plot freezing up on hover #8052 stops the plot from freezing, but hover is still laggy
• Also related to [BUG]: scattergl hover freezes with more than 100.000 points all with different x but same y #8036