[expo-calendar] [iOS] Don't check calendar permissions for saving reminders, and fix missing details when saving calendar events

[robertying]

Why

expo-calendar is broken on iOS with the latest canary build. Issues I have found so far:

• Calendar event title and color is not being saved properly.
• Calendar event endDate is always the same as startDate.
• The module checks for calendar permissions even when saving reminders.

How

Added the missing code and fixes.

Test Plan

• Call createEventAsync or createReminderAsync with all the details and the correct events/reminders are saved in Calendar or Reminders.
• Request only for reminder permissions and try to call createReminderAsync doesn't throw with the missing permission error.

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[alanjhughes]

Looks good ✅ Thanks for the contribution! 👍