feat: add task reminders

[pratikb64]

Add a feature to send users a reminder via in-app notification and email for their due tasks. Reminders will be sent 1 day before and 1 hour before the due date.

Change log

• Added email template for the reminders email
• Added scheduler events and hooks to check for notifications for both 1-hour and 1-day durations
• Handled task reminder notifications in Notification component

Email notification example

Closes #1798

[codecov]

Codecov Report

❌ Patch coverage is 14.89362% with 80 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.65%. Comparing base (fd5d7ea) to head (34154ca).
⚠️ Report is 14 commits behind head on develop.

Files with missing lines	Patch %	Lines
crm/api/todo.py	17.07%	68 Missing ⚠️
crm/api/notifications.py	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1822      +/-   ##
===========================================
- Coverage    62.27%   61.65%   -0.63%     
===========================================
  Files          122      122              
  Lines         7024     7124     +100     
===========================================
+ Hits          4374     4392      +18     
- Misses        2650     2732      +82     

Files with missing lines	Coverage Δ
crm/hooks.py	100.00% <ø> (ø)
crm/api/notifications.py	0.00% <0.00%> (ø)
crm/api/todo.py	43.44% <17.07%> (-54.06%)	⬇️

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[shariquerik]

@mergify update

[mergify]

update

✅ Branch has been successfully updated