Multilayer time axis should read dow from moment locale

[nickofthyme]

Is your feature request related to a problem? Please describe.

In the multilayer time axis we hard code the start day of the week to 1 (aka Monday). This does not allow the chart consumer to change this to adapt to the data.

elastic-charts/packages/charts/src/chart_types/xy_chart/axes/timeslip/continuous_time_rasters.ts

Line 320 in 3bddec8

if (dayOfWeek !== 1) continue;

Demo

See demo here.

Describe the solution you'd like
The start day of the week should be driven by the moment.localeData().firstDayOfWeek()

Describe alternatives you've considered
N/A

Additional context
This only applies to the tick placement and labels, not the placement of the rendered geometries.

Kibana Cross Issues

elastic/kibana#178115

Checklist

• this request is checked against already exist requests
• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present