feat: implement pushbullet notifications

[KarinaOliinyk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 116 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.72%. Comparing base (b20a452) to head (31c4ecc).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...dules/notification_channel/providers/pushbullet.go	0.00%	114 Missing ⚠️
...erver/src/modules/notification_channel/listener.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   17.84%   17.72%   -0.13%     
==========================================
  Files         161      162       +1     
  Lines       16623    16738     +115     
==========================================
  Hits         2967     2967              
- Misses      13512    13627     +115     
  Partials      144      144              

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