Collapsible Calendar

[s-egge]

Allow the calendar to collapse/expand so that it's easier to interact with the DayView component.

[s-egge]

After some testing and digging in to the React Native Calendar's Github Issues, their ExpandableCalendar component has too many issues right now for us to be able to use it.

Most of the issues I encountered have been brought up, some of them a long time ago, but there is not much developer activity on them or the PRs that address some of the issues.

• Virtualized List error and calendar lag
  • One suggestion was to disable horizontal scrolling, but setting the prop for ExpandableCalendar didn't properly disable it.
• SelectedDate (and custom colored dates as shown in the issue) are hidden at the bottom on some screens. This one has a suggested patch to fix it, so it's only a minor issue.
• Support for defaultProps will be removed error.

We should still try to make it easier to see the DayView component, either by creating our own collapse functionality or putting the calendar into the ScrollView. We can potentially use the WeekCalendar component to make our own collapse functionality that is similar to the ExpandableCalendar component, but it does not come with a header I haven't been able to add a CustomHeader to it even though it worked for the ExpandableCalendar, so we may need to work around that.