feature: add configuration for notifications

[Gigas002]

Closes: #334

Actual notification features differs depending on user's notification daemon, e.g. most lightweight daemons like dunst or mako doesn't support sound playback, so the parameter doesn't have any effect.

Examples:

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.61%. Comparing base (7112e6c) to head (cafbe88).

Files with missing lines	Patch %	Lines
wayshot/src/notification.rs	0.00%	36 Missing ⚠️
wayshot/src/wayshot.rs	0.00%	2 Missing ⚠️
wayshot/src/settings.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
- Coverage   16.73%   16.61%   -0.12%     
==========================================
  Files          20       20              
  Lines        3149     3171      +22     
==========================================
  Hits          527      527              
- Misses       2622     2644      +22     

Flag	Coverage Δ
libwayshot	22.05% <ø> (ø)
wayshot	0.00% <0.00%> (ø)

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[Decodetalkers]

Wait.. maybe we should just control the action of failure? Or maybe always being critical will be enough? I want to hear more opinions

This part maybe good. We can ship it. But I want let another person also decide it

[Decodetalkers]

+1

[Shinyzenith]

I think I'm happy with this and we can merge, took an overall glance at the code, if you're happy with it @Decodetalkers merge it @Gigas002