Add WeekInput
Add WeekInput

For the lag of a java.time.YearWeek, the current implementation uses
org.threeten.extra.YearWeek.

See
https://www.w3.org/TR/2017/REC-html52-20171214/sec-forms.html#week-state-typeweek

Contributes to geb/issues#553

geb/geb,geb/geb