AttributeUi: Local Day of week

[rpbouman]

As it turns out, the structure of the week is localized.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo

This affects things like what is considered the first day of the week as well as what is considered a weekend.

Currently we do not take this into account, and when we choose day of week, we order them according to DuckDb's dayofweek, with sunday = 0, monday = 1, etc. (https://duckdb.org/docs/sql/functions/datepart#dayofweekdate)

Just like we have a derivation for the "local" version of date/time values, we should support that for the week. This would affect the ordering of the days