feat: 6289 - bulk proof upload page

[monsieurtanuki]

What

• Now there's a new experimental "bulk proof upload" feature, activated by dev mode (deactivated by default)
• With this feature, the user specifies the location, the date and the currency.
• Then the user can send individual proofs, one at a time, in background: when the user clicks on the "send the proof" button, the proof is uploaded in the background and the page is cleared, ready for a new proof with the same location/date/currency

Screenshots

For the record I tested in TEST env, with pictures of my holidays in Japan in 2012. I know you wanted to know that but were too shy to ask.

dev mode page	price page

bulk proof upload page	proof image selected

exiting without saving	uploading and clearing

Fixes bug(s)

• Closes: Allow bulk proof addition for Open Prices (with just date and location) #6289

Files

New files:

• price_add_helper.dart: Helper around price/proof adding pages.
• proof_bulk_add_page.dart: Single page that displays all the elements of bulk proof adding.
• proof_type_extensions.dart: Extensions on ProofType.

Impacted files

• app_en.arb: added a label for "bulk proof upload" and "send proof"
• price_model.dart: new method clearProof
• price_proof_card.dart: refactoring about the flexibility needed for new fields ProofType? forcedProofType and bool includeMyProofs
• product_price_add_page.dart: refactored with new class PriceAddHelper
• proof_crop_helper.dart: minor refactoring
• user_preferences_dev_mode.dart: added a "bulk proof upload" feature flag (false/hidden by default)
• user_preferences_prices.dart: optionally display a button to the new "bulk proof upload" page

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.46083% with 216 lines in your changes missing coverage. Please review.

Project coverage is 5.81%. Comparing base (4d9c7fc) to head (e2f6a22).
Report is 789 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../smooth_app/lib/pages/prices/price_add_helper.dart	0.00%	84 Missing ⚠️
...ooth_app/lib/pages/prices/proof_bulk_add_page.dart	0.00%	66 Missing ⚠️
.../smooth_app/lib/pages/prices/price_proof_card.dart	2.63%	37 Missing ⚠️
...h_app/lib/pages/prices/product_price_add_page.dart	0.00%	9 Missing ⚠️
...lib/pages/preferences/user_preferences_prices.dart	0.00%	5 Missing ⚠️
...kages/smooth_app/lib/pages/prices/price_model.dart	0.00%	5 Missing ⚠️
...th_app/lib/pages/prices/proof_type_extensions.dart	0.00%	5 Missing ⚠️
...b/pages/preferences/user_preferences_dev_mode.dart	0.00%	4 Missing ⚠️
...ckages/smooth_app/lib/pages/proof_crop_helper.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6437      +/-   ##
==========================================
- Coverage     9.54%   5.81%   -3.73%     
==========================================
  Files          325     493     +168     
  Lines        16411   29367   +12956     
==========================================
+ Hits          1567    1709     +142     
- Misses       14844   27658   +12814     

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