feat: Push Notifications

[fshabanov]

What feature?

Users should receive push notifications, when the deadline for their task(s) has come. We will use AWS for that:
When creating a task, create a schedule in AWS EventBridge Scheduler for when the deadline will be
AWS EventBridge Scheduler should send a message (user id) to AWS SNS
Our Backend should be subscribed to AWS SNS messages
When receiving a user id from SNS, we need to send a push notification

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