Us/13: Add Event in Calendar from DayView/WeekView page

[thclmnt]

Allow application to access calendar to add event from long pressing a class in DayView & WeekView page.

Notable changes:

• Added permissions for Android & iOS in app.json
• Added a long press event in CourseRow component
• Created a new modal/popup with new translations to confirm wanting to add event to calendar
• Handled app permissions to trigger only when user wants to add an event
• Added Toast to notify if event was successfully added to calendar or not
• Fixed a bug for Toast not working properly without react-native-root-siblings package in newer versions of React Native
• Added more information in FetchManager for events to be created with proper date