fix: Background image upload

[AshAman999]

What

• An initial implementation of using workmanager to do image upload in the background

Benefits

• Background image upload
• upload completes whenever there is good internet
• once upload scheduled , will retry for five times before finally giving up
• Task remains even when phone starts or app closed

Problems

• can't easily manage app state when using workmanager [WIP] alternate ways to let users know if the task is done(possibly other menus)
• ios setup is still not configured,(yet to be done,)

Fixes bug(s)

• Fixes: The "uploading image" dialog should not block the user from moving to the next photo #1593 Uploading photos on server takes too much time #2192 Ensure there’s a placeholder for offline newly added products until it’s possible to fetch them from the network #2459

Part of

• (Product Addition) The "uploading image" dialog should not block the user from moving to the next photo #1393

[codecov-commenter]

Codecov Report

Merging #2433 (eba8d96) into develop (ac19a9c) will decrease coverage by 0.16%.
The diff coverage is 0.47%.

@@            Coverage Diff             @@
##           develop   #2433      +/-   ##
==========================================
- Coverage     7.04%   6.88%   -0.17%     
==========================================
  Files          219     221       +2     
  Lines        10874   11161     +287     
==========================================
+ Hits           766     768       +2     
- Misses       10108   10393     +285     

Impacted Files	Coverage Δ
...th_app/lib/cards/data_cards/image_upload_card.dart	0.00% <0.00%> (ø)
...oth_app/lib/data_models/continuous_scan_model.dart	0.83% <0.00%> (ø)
...h_app/lib/data_models/onboarding_data_product.dart	0.00% <0.00%> (ø)
.../smooth_app/lib/data_models/onboarding_loader.dart	0.00% <ø> (ø)
...p/lib/generic_lib/dialogs/smooth_alert_dialog.dart	15.70% <ø> (ø)
...smooth_app/lib/generic_lib/duration_constants.dart	0.00% <0.00%> (ø)
...smooth_app/lib/helpers/background_task_helper.dart	0.00% <0.00%> (ø)
...smooth_app/lib/helpers/picture_capture_helper.dart	0.00% <0.00%> (ø)
...e_panel/knowledge_panels/knowledge_panel_page.dart	0.00% <ø> (ø)
packages/smooth_app/lib/main.dart	14.52% <0.00%> (-0.13%)	⬇️
... and 18 more

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[monsieurtanuki]

Thank you @AshAman999, that looks rather good.
I've never used workmanager before though, therefore there are things I may have missed.
Beyond my detailed comments, I have some questions:

• I'm not convinced by the increasing delay (what delay is that btw? the delay from the moment I clicked on upload or from the latest unsuccessful attempt?). I guess a call to sentry would make sense ("hey we've got this guy and we cannot upload his picture"), as would an alert to the end-user.
• Wouldn't it be nice to display somewhere the list of the pending tasks?
• How do you refresh the app when the picture is uploaded? I saw something about the carousel, but I don't think it would refresh a product page, would it?

[teolemon]

are there any outstanding issues left @AshAman999 @g123k ?

[AshAman999]

are there any outstanding issues left @AshAman999 @g123k ?

@teolemon
Though as of now, nothing is blocking, but still, I was thinking to create an internal release with the pr to have things tested out before we finally merge it to develop.
@g123k ?

[g123k]

LGTM :)
We can now test the feature

[teolemon]

Ok, going to merge