feat: support variable colorScale length, use jenks natural breaks for default legend

[bodom0015]

Problem

colorScale is hard-coded, quantiles are currently using hard-coded percentiles

Jenks natural breaks might be better than quantiles in some scenarios

Approach

• Calculate percentiles based on length of the colorScale - this allows us to use as few/many colors as we want
• Use jenks natural breaks by default (instead of quantile bins) - this enables us to easily switch back and forth between these different binning techniques
  • Need to ignore NaN values when computing this, or else we see errors
  • In the future, we could offer this to the user in the UI as a toggle switch

How to Test

TBD

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[bodom0015]

Initially, some data (such as "Observed Particulate Matter (PM2.5)") didn't agree with the jenks method:

react-dom.development.js:11340 Uncaught TypeError: Cannot read properties of undefined (reading '2')
    at jenksBreaks (jenks_breaks.js:21:1)
    at jenks (jenks.js:37:1)
    at SummaryMapPage (SummaryAndMap.js:207:1)
    at renderWithHooks (react-dom.development.js:14985:1)
    at mountIndeterminateComponent (react-dom.development.js:17811:1)
    at beginWork (react-dom.development.js:19049:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:3945:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:3994:1)
    at invokeGuardedCallback (react-dom.development.js:4056:1)
    at beginWork$1 (react-dom.development.js:23964:1)

There is one or more data point in this set that has a value of NaN (not a number), and this caused the above error. Filtering out the NaN values before computing allows us to get the jenks natural breaks or quantile bins without encountering the same error :+1: