Feat/ Play adhan and show notification when app is on foreground

[ghassenbenzahra123]

📝 Summary

This PR fixes #719

Description

• Play adhan and show notification when app is on foreground

Demo

20240910_185152.mp4

Checklist:

• Coding Standards: I have reviewed my code to ensure it follows the project's coding standards.
• Testing: I have tested the changes and they work as expected.
• Merge Conflicts: I have resolved any merge conflicts with the latest main/development branch.
• Branch Status: The branch is up-to-date with the target branch (main/development).

[YassinNouh21]

the build failed https://codemagic.io/app/620d135f8c8d2d3923271d81/build/6793b405a5b21dac87206f40

[YassinNouh21]

this will crach onvo tv

[YassinNouh21]

The BackgroundService class is handling too many responsibilities - audio playback, notifications, and prayer scheduling.
Consider splitting it into separate services:
PrayerSchedulerService
AdhanAudioService
PrayerNotificationService

[YassinNouh21]

services/audio_service
service/adhan_notification_service

[YassinNouh21]

there is no clean up or dispose for the audioPlayer and notificaiton

 @override
  Future<void> dispose() async {
    _notificationTimer?.cancel();
    await _audioPlayer?.dispose();
    await dismissExistingNotification();
    _scheduledTimes.clear();
    super.dispose();
  }

[YassinNouh21]

to make it more thread safe

static final _lock = Lock(); // The "ticket system"
static final Set<DateTime> _scheduledTimes = {};

static void schedulePrayerTasks(...) async {
  await _lock.synchronized(() async { 
    if (_scheduledTimes.contains(scheduleTime)) return;
    _scheduledTimes.add(scheduleTime); 
    _schedulePrayerTimer(...); 
  }); 
}

what can produce Users get multiple alerts for the same prayer time.

[YassinNouh21]

'$salahName time ($prayerName) notification' // Not localized