Show data values on charts (#11363)

* get the ball rolling

* cleanup

* show compact values on bars

* line charts

* basic value label styling

* add options for area chart

* pre/post render checks on label density

* show chart labels under local minima on line charts

* flow & eslint fixes

* drop every nth if too dense

* Auto fit, show all

* hide setting for multiseries

* fix label positioning for histograms and ordinal bar charts

* turn off value labels for normalized charts

* fix dashboard bug

* small cleanup

* work around safari issue

* don't try to show chart values if there are duplicate x values

* keep black text in night mode

* make outline match night mode bg

* tweak sample size, default show values to "on" for bar charts with <25

* settings copy changes

* don't let labels fall below the x axis