AnyCalendar locale constructor naming

[sffc]

#5842 changed the argument of AnyCalendar::new_for_locale to take AnyCalendarPreferences instead of Locale, but it did not change the name of the function.

Please note that there is already another function AnyCalendar::new that takes an AnyCalendarKind.

Should we:

1. Leave things the way they are now
2. Change the new function to work with preferences and change the AnyCalendarKind constructor to be new_for_kind
3. Change new_for_locale to new_for_preferences
4. Add new_for_preferences and keep new_for_locale the way it was before
5. ?

I would rather not make this decision myself.

Needs input from: @zbraniecki @Manishearth and others

[Manishearth]

No strong preference, but: 4 ~> 2 ~> 3 ~> 1

[zbraniecki]

2 >> 3 >> 1 = 4