added new apis to get user notifications and bulk update status

[Ishankoradia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 48.83721% with 22 lines in your changes missing coverage. Please review.

Project coverage is 74.44%. Comparing base (b07abb1) to head (2e90c57).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
ddpui/core/notifications_service.py	33.33%	14 Missing ⚠️
ddpui/api/notifications_api.py	57.89%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #855      +/-   ##
==========================================
- Coverage   74.63%   74.44%   -0.20%     
==========================================
  Files         191      191              
  Lines        7914     7949      +35     
==========================================
+ Hits         5907     5918      +11     
- Misses       2007     2031      +24     

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