InputDatetime 日期时间使用体验问题

amis提供的各种日期时间类组件操作不统一问题

1、InputDate日期：点击日期后选中，并且弹层关闭
2、**InputDatetime日期时间：需要点击屏幕其他地方才会选中，操作体验和其他组件不一样，建议增加确定按钮**
3、InputDateRange 日期范围：点击确认按钮选中，并且关闭弹层
4、InputDatetimeRange 日期时间范围：点击确认按钮选中，并且关闭弹层

Start by locating the InputDatetime component and comparing its selection behavior with InputDate and InputDatetimeRange. Confirm the intended interaction from the issue: selecting a date and time should use a confirmation action consistently, close the popup, and be covered by the relevant component tests if they exist.

Written by the indexing model from the issue text.