* chore: Add _ClearDateFieldButton
* chore: Add new DateCellCalendarEvent to clear date
* chore: Add grid_field_clearDate translation token
* refactor: _ClearDateFieldButton -> _ClearDateButton
* fix: Fix dart(unused_element) in _ClearDateButton
* feat: Handle clearDate
* Revert "feat: Handle clearDate"
This reverts commit fd145ef8e9589f3b4aa1a16e5d72c15b6d0b53c4.
* feat: Handle clearDate
* feat: Add clear_flag field
* feat: check clear_flag to clear date
* chore: update exisitng tests
* fix: add mssing import
* refactor: remove check for timeFormatError
* fix: fix margin on _ClearDateButton
* refactor: _ClearDateButton -> ClearDateButton
* test: add clear date backend unit test
* test: add clear date integration test
* test: add clear date to edit time cell test
* chore: mark ClearDateButton visible for testing
* feat: close date editor popover on clear date
* style: make AppFlowyPopover taller
* fix: trim dateStr in _dateStrFromCellData
* fix: don't dismiss CellEditor after clearDate