feat: 831 - prices methods getProofs, getProof and getUsers + fixed uploadProof

[monsieurtanuki]

What

• The "prices" API evolved since the last time we implemented it in dart. We needed to keep up.
• New methods: getProofs, getProof and getUsers
• Fixed method uploadProof
• Added fields to Price, PriceProduct and Location

Part of

• Adding support for the Prices project #831
• Open Prices (tracker) smooth-app#5072
• Replicate the 'Add a single price' view from the Open Prices web app smooth-app#5195
• Replicate the 'Product page' view from the Open Prices web app smooth-app#5197
• Replicate the 'Last added prices' view from the Open Prices web app smooth-app#5198
• Replicate the 'My Prices' view from the Open Prices web app smooth-app#5205
• Replicate the 'Personal dashboard' view from the Open Prices web app smooth-app#5206
• Replicate the 'My Proofs' view from the Open Prices web app smooth-app#5207
• Replicate the 'Top Contributors' view from the Open Prices web app smooth-app#5210

Files

New files:

• flavor.dart: Flavor is used to refer to a specific Open*Facts project.
• get_price_count_parameters_helper.dart: Helper class for API query parameters with price count filters.
• get_proofs_order.dart: Field for the "order by" clause of "get proofs".
• get_proofs_parameters.dart: Parameters for the "get proofs" API query.
• get_proofs_result.dart: List of proof objects returned by the "get proofs" method.
• get_proofs_result.g.dart: generated
• get_users_order.dart: Field for the "order by" clause of "get users".
• get_users_parameters.dart: Parameters for the "get users" API query.
• get_users_result.dart: List of price user objects returned by the "get users" method.
• get_users_result.g.dart: generated
• price_user.dart: Price user object.
• price_user.g.dart: generated

Impacted files:

• api_prices_test.dart: added tests for new methods getProofs, getProof and getUsers; fixed test of method uploadProof
• badge_base.g.dart: unrelated file generation change
• events_base.g.dart: unrelated file generation change
• get_locations_parameters.dart: refactoring
• get_locations_result.g.dart: unrelated file generation change
• get_parameters_helper.dart: refactoring
• get_prices_parameters.dart: refactoring
• get_prices_result.g.dart: unrelated file generation change
• key_stats.g.dart: unrelated file generation change
• knowledge_panel_element.g.dart: unrelated file generation change
• leaderboard_entry.g.dart: unrelated file generation change
• location.dart: new field priceCount
• location.g.dart: generated
• ocr_ingredients_result.g.dart: unrelated file generation change
• ocr_packaging_result.g.dart: unrelated file generation change
• old_product_result.g.dart: unrelated file generation change
• open_prices_api_client.dart: new methods getProofs, getProof and getUsers; fixed method uploadProof
• openfoodfacts.dart: exported the new files
• price.dart: new fields proof, location and product
• price.g.dart: generated
• price_product.dart: new fields
• price_product.g.dart: generated
• product.g.dart: unrelated file generation change
• product_stats.g.dart: unrelated file generation change
• product_tag.g.dart: unrelated file generation change
• proof.dart: removed old field (that provoked test failure anyway)
• proof.g.dart: generated
• pubspec.yaml: upgraded packages to more recent versions - while not too recent either
• spelling_corrections.g.dart: unrelated file generation change

[teolemon]

That's really great @monsieurtanuki 🤑

[monsieurtanuki]

Thank you @teolemon for your review!
With this PR we should be able to code most of the "prices" features inside Smoothie.