refactor: Make smooth_app a module (also called step 1)

[g123k]

This PR implemented the "Step 1" of the migration:

• Add the package attribute for all assets files
• Create an app package (empty for now)
• Add smooth_app as a dependency

New entry points are:

• On Android 🤖: flutter run -t lib/entrypoints/android/main_google_play.dart
• On iOS 🍎: flutter run -t lib/entrypoints/ios/main_ios.dart on iOS

[monsieurtanuki]

Hi @g123k!
I approve your code regarding the "initial step 1", i.e. adding a package parameter to the asset file references in dart files. The rest is beyond my added value.

[monsieurtanuki]

Not sure about this.

[g123k]

Don't worry, this is OK for this one.
This is the name of the app VS smooth_app Android app

[g123k]

It seems that everything is now OK.
The idea is to do non-regression tests.

No new feature is available in this step

[g123k]

Is there someone to review/merge this PR?
I would like to implement the other steps :)

[M123-dev]

I haven't double checked everything (this is a mobile review)

Just the .gitingore and I noticed we have a Linux macOS and Windows folder in /app/
We probably don't need that

[M123-dev]

Isn't the global .gitignore enouph

[g123k]

Thanks for the review Marvin.

For the "desktop" folders, there is an issue about the support of those platforms.
We won't release on them, but it will allow us to run the app without an emulator/simulator.

For the .gitignore, we have the same file in the smooth_app package. It's actually the generated one.

[codecov-commenter]

Codecov Report

Merging #3101 (7cdf69a) into develop (7a3eb41) will increase coverage by 0.04%.
The diff coverage is 40.90%.

@@            Coverage Diff             @@
##           develop   #3101      +/-   ##
==========================================
+ Coverage     6.40%   6.44%   +0.04%     
==========================================
  Files          247     248       +1     
  Lines        12324   12337      +13     
==========================================
+ Hits           789     795       +6     
- Misses       11535   11542       +7     

Impacted Files	Coverage Δ
...p/lib/cards/category_cards/raster_async_asset.dart	0.00% <0.00%> (ø)
..._app/lib/cards/category_cards/svg_async_asset.dart	0.00% <0.00%> (ø)
...cards/product_cards/smooth_product_card_error.dart	0.00% <ø> (ø)
...ards/product_cards/smooth_product_card_thanks.dart	8.33% <ø> (ø)
..._app/lib/data_models/abstract_onboarding_data.dart	0.00% <0.00%> (ø)
...h_app/lib/data_models/onboarding_data_product.dart	0.00% <0.00%> (ø)
...ges/smooth_app/lib/generic_lib/loading_dialog.dart	0.00% <ø> (ø)
...app/lib/generic_lib/widgets/picture_not_found.dart	33.33% <ø> (ø)
...app/lib/generic_lib/widgets/smooth_error_card.dart	100.00% <ø> (ø)
...ackages/smooth_app/lib/helpers/network_config.dart	0.00% <0.00%> (ø)
... and 21 more

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