RDKB-65401: Aker to support push notifications

[guruchandru]

Reason for change: Enable push notifications for scheduled downtime
Test Procedure: Functional testing on device with active schedules

Risks: Medium
Priority: P1

[codecov]

Codecov Report

❌ Patch coverage is 43.35196% with 507 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.84%. Comparing base (d77b02e) to head (229cbd6).

Files with missing lines	Patch %	Lines
src/aker_notification.c	44.88%	350 Missing and 81 partials ⚠️
src/aker_rbus.c	7.46%	62 Missing ⚠️
src/scheduler.c	71.79%	7 Missing and 4 partials ⚠️
src/main.c	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #190       +/-   ##
===========================================
- Coverage   66.29%   55.84%   -10.46%     
===========================================
  Files          15       17        +2     
  Lines        1362     2351      +989     
  Branches        0      528      +528     
===========================================
+ Hits          903     1313      +410     
- Misses        459      881      +422     
- Partials        0      157      +157     

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