IgxGrid filter: IgxDatePicker.weekStart not changable

[Timmeeeey]

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

Currently it is not possible to set weekStart for grid IgxDatePicker filter.
It is always set to Sunday.

Describe the solution you'd like

A possible solution would be to make weekStart globally configurable.
See #10543

Describe alternatives you've considered

Alternatively the first day of week could be read from current locale.

[github-actions]

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