* First pass at grouping axes

This PR uses the results_metadata key to look at fingerprints for numerical axes to try determine if each series on
the Y axis can be sanely represented on the same axis.

This is done by calculating an overlap (some value between 0 and 1) and grouping all axes on the LEFT if they pass the threshold, which is
some value between 0 and 1. The overlap is always calculated when there is SOME overlap between the ranges of each
axis, and is calculated as:

```clojure
(/ (- (max maximums) (min minimums))
   (- (min maxiumums) (max minimums)))
```

This is done to try catch situations where one column's range is entirely inside the other, but is much smaller (- max
min); such a case would have a small percent overlap by the above calculation, and implies that it might be better to
split the axes.

* Address feedback.

* Fix shape of data in tests of 2 private fns

* Add test for split axes

* Fixed error in test util

* render-utils does with-redef, disallows parallel tests. Makes sense