Integrate tasks into notifications

[nriedman]

Problem

Currently, notifications are just informative, and do not reflect To-dos. Moving forward, we want to be able to sent a reminder to the user to complete a task, and the notification should feature a button to directly go to this task.

Solution

Restructure the notifications class on the backend to reflect the new Firebase data structure, including an option for a task associated with the notification. Based on this task, create a UI element to bring the user directly to the section of the app where they can complete this task (e.g. bring up a sheet with the symptom survey).

Additional context

No response

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