feat: 5594 - multi product scan mode as a dev mode option for price receipt input

[monsieurtanuki]

What

• Now there's a new switch in DEV MODE: "multi-products selection for prices"
• When the switch is true (default is false), when we scan products for prices (e.g. new receipt page) we're able to scan several barcodes in a row, and tap on the floating action button to say "hey, I'm done"

Screenshots

dev mode switch	1 scanned product

2 scanned products	receipt w/ 2 products

Fixes bug(s)

• Closes: Have an option for continous scanning when entering prices #5994

Impacted files

• price_add_product_card.dart: now calling the scan card with the bool multi product scan mode parameter, and manages a list of scanned barcodes
• price_scan_page.dart: now manages a multi product scan mode, with floating action button and snackbar
• user_preferences_dev_mode.dart: new flag for "multi product scan in price receipt"

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 66 lines in your changes missing coverage. Please review.

Project coverage is 6.48%. Comparing base (4d9c7fc) to head (4ac5e85).
Report is 566 commits behind head on develop.

Files with missing lines	Patch %	Lines
...h_app/lib/pages/prices/price_add_product_card.dart	0.00%	35 Missing ⚠️
...s/smooth_app/lib/pages/prices/price_scan_page.dart	0.00%	25 Missing ⚠️
...b/pages/preferences/user_preferences_dev_mode.dart	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6008      +/-   ##
==========================================
- Coverage     9.54%   6.48%   -3.07%     
==========================================
  Files          325     441     +116     
  Lines        16411   25061    +8650     
==========================================
+ Hits          1567    1624      +57     
- Misses       14844   23437    +8593     

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[teolemon]

@monsieurtanuki @g123k this would be interesting to quickly populate user lists (eg a shopping list).

[monsieurtanuki]

@monsieurtanuki @g123k this would be interesting to quickly populate user lists (eg a shopping list).

@teolemon That wouldn't be a problem as we already have the tool for that: a camera+scanner that calls an "I've just found that barcode!" method. In this PR the method populates a list of barcodes, pop'ed only when the user clicks on the FAB.

If you have a new idea for user lists, please create a specific issue.
And don't hesitate to review the current PR ;)