feat: Added a service for displaying snacks

[internetova]

Checklist

A service has been written that will help you use flutter_easy_dialogs to display snacks "out of the box".

2024-04-11.14.47.33.mov

screencast with animation:

2024-05-07.17.05.07.mov

top padding:

new padding:

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• Is there an existing issue for this PR?
  • link issue here (use keywords like fix, close, resolve etc. if necessary)
• Have the files been linted and formatted?
• Have the docs been updated to match the changes in the PR?
• Have the tests been updated to match the changes in the PR?
• Attached videos/screenshots demonstrating the fix/feature.
• Have you run the tests locally to confirm they pass?

New Features

What new capabilities does this PR add?

What docs changes are needed to explain this?

[github-actions]

Link to Pyrus task

[dzmitry-struk-surf]

I think it is not a good idea to hold BuildContext as a field in the class. Can we add BuildContext as a parameter to the showSnack method?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.75188% with 132 lines in your changes are missing coverage. Please review.

Project coverage is 23.16%. Comparing base (339c48c) to head (46893e3).
Report is 17 commits behind head on main.

Files	Patch %	Lines
...tures/snack_queue/presentation/snack_queue_wm.dart	0.00%	63 Missing ⚠️
...k_queue/presentation/default_snack_controller.dart	3.84%	25 Missing ⚠️
...tures/debug/presentation/ui_kit/ui_kit_screen.dart	0.00%	18 Missing ⚠️
.../features/debug/presentation/ui_kit/ui_kit_wm.dart	0.00%	8 Missing ⚠️
...s/snack_queue/presentation/snack_queue_widget.dart	0.00%	5 Missing ⚠️
...snack_queue/presentation/snack_queue_provider.dart	0.00%	4 Missing ⚠️
...atures/snack_queue/presentation/top_snack_bar.dart	0.00%	4 Missing ⚠️
lib/l10n/app_localizations_en.g.dart	0.00%	2 Missing ⚠️
lib/l10n/app_localizations_ru.g.dart	0.00%	2 Missing ⚠️
...es/snack_queue/presentation/snack_queue_model.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   26.39%   23.16%   -3.23%     
==========================================
  Files          55       61       +6     
  Lines         917     1049     +132     
==========================================
+ Hits          242      243       +1     
- Misses        675      806     +131     

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[dzmitry-struk-surf]

Please, provide a video on how it works now.

[DmitrDomrachev]

Please, provide a video on how it works now.

I added a screencast to the description of the PR