…been initially realized

…e the function failure of flutter_local_notification

… failed

…inder_services

… the permission request

…page

- Add a registrar to handle notification click events in a concreted manner

This function need long-term test (About 7 days).

TEST_STATUS: long-term

- simplify the validateAndUpdateNotifications() logic
- fix the function failure of CourseReminder Update while the XDYou start
- always-on debugging plugin for debugging

TEST_STATUS: long-term(3 days)

…imentData

…raintime_pda into feat/reminderBeforeClass

- modify the way of generating notification id to solve the problem of the reminder overlapped

- Remove the test widget in NotificationPage
- Hide the access of the NotificationServices on the desktop platform
- Create a new page for displaying NotificationService test widget

…or testing

feat: reminder before class
 - apple platform pentending testing