tickFormatter for legend, tooltip and axis

[nickofthyme]

Is your feature request related to a problem? Please describe.
Have a way to format/truncate the axis labels without effecting the tooltip values.

Describe the solution you'd like
I think it would be too convoluted to have a tick formatter for legend, tooltip and axis. A better solution may be to have a third parameter to the tooltip function for where the value is used.

type Scope = 'tooltip' | 'legend' | 'axis';
export type TickFormatter = (value: any, options?: TickFormatterOptions, scope?: Scope) => string;

Then we can call this in any place differently without using three separate formatter functions. Similarly to how we currently handle naming.

elastic-charts/src/chart_types/xy_chart/utils/specs.ts

Lines 88 to 91 in 2e26430

	/**
	* Function to create custom series name for a given series
	*/
	export type SeriesNameFn = (series: XYChartSeriesIdentifier, isTooltip: boolean) => SeriesName;

Describe alternatives you've considered
No real way to separate these cases as it currently stands.

[markov00]

🎉 This issue has been resolved in version 19.9.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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