* heatmap wip
* format values on X axis
* format values for cells
* show labels
* support legend configuration
* render preview
* add icon
* [ML] update visualization
* [ML] init suggestions
* [ML] fix preview
* [ML] fix groupPosition for the legend control
* [ML] add formatter for Y-axis
* [ML] filterOperations for cell value
* [ML] fill all available height
* [ML] delete unused file
* [ML] fix suggestion state
* [ML] update suggestion, add hiding logic
* [ML] suggestions unit tests
* [ML] rename legend interface
* [ML] unit tests for visualization, add error messages
* [ML] fix typos in xy visualization tests
* [ML] support click event
* [ML] add xDomain for time series data
* [ML] support empty Y axis
* [ML] change legend default position
* [ML] getTimeZone util
* [ML] hide suggestions for reorder
* [ML] support brush event
* [ML] update unit tests
* [ML] render grid lines in preview
* [ML] don't display errors on init
* [ML] utilize chartsThemeService
* [ML] support histogram for the vertical axis
* [ML] fix clearLayer
* [ML] show empty placeholder on no data
* [ML] fix X domain min
* [ML] reject suggestions for 3 or more buckets
* [ML] suggestions for histograms and histogram for Y-axis
* [ML] fix unit tests
* [ML] update suggestions for active heatmap
* [ML] chart data test for heatmap
* [ML] test for transitioning from heatmap to barchart
* [ML] disable xDomain
* [ML] support intervals in axes configurations
* [ML] hide label on the vertical axis when there is only a horizontal dimension
* [ML] set min cell height for better suggestions preview rendering
* [ML] fix tooltip for empty vertical axis config
* [ML] fix click and brushing for empty Y axis
* [ML] update functional test
* [ML] show beta label
* [ML] fix legend control
* [ML] dataIndex sort by default for the X axis
* [ML] use euiPaletteForTemperature with quantize color scale
* [ML] hide all suggestions
* [ML] fix chart data extension issue
* [ML] fix the caret symbol positioning
* [ML] update unit tests for the heatmap suggestions
* [ML] replace EuiBetaBadge with EuiBadge
* [ML] update functional test
* [ML] fix chart switch styles
* [ML] fix functional test
* [ML] return null instead of expression with a missing value accessor
* [ML] use table id as a chart id
* [ML] fix scale type for a single row of data
* [ML] filter out undefined values
* [ML] fix isXAxisLabelVisible
* [ML] update chart_switch styles
* show warning message for the array values
* remove unused code
* replace ts-ignore with manual type casting
* add unit tests for error and warning messages
* add css class for append, conditional flex group
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