feat(Calendar): Add `firstDayOfWeek` prop (#7363)
* add firstDayOfWeek prop
* pass to DatePicker/DateRangePicker
* add storybook controls
* add to RAC
* add docs
* add v3 tests
* add hook tests
* lint
* add chromatic stories
* update v3 RangeCalendar styles for first and last day of week
* lint
* lint
* use number instead of enum for type
* update type to enum
* update tests
* fix v3 cell style
* use lowercase and update docs
* update to use firstDayOfWeek day regardless of locale
* lint
* fix cell style
* more tests
* update test
* update getDatesInWeek logic
* fix test
* fix null dates
* fix minimum dates case
* add offset logic to startOfWeek
* lint
* pass firstDayOfWeek into getWeeksInMonth
* add firstDayOfWeek param to endOfWeek
* add firstDayOfWeek to getDayOfWeek
* pass firstDayOfWeek to getDayOfWeek
* slight simplification and add tests
* add docs
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Co-authored-by: Devon Govett <devongovett@gmail.com>
