feat: 831 - more parameters for the "get prices" API query

[monsieurtanuki]

What

• More refined parameters for the "get prices" API query.
• Including the "order by" clause, useful for Smoothie (get the latest prices for that product).

Part of

• Adding support for the Prices project #831

Files

New files:

• get_parameters_helper.dart: Helper class for API query parameters.
• get_prices_order.dart: Order clause for "get prices".
• get_prices_parameters.dart: Parameters for the "get prices" API query.

Impacted files:

• api_prices_test.dart: elaborated the test of "get prices"
• open_prices_api_client.dart: refactored
• openfoodfacts.dart: 2 new exported files

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (7615fcb) 75.99% compared to head (bcd25c4) 76.33%.

Files	Patch %	Lines
lib/src/prices/get_parameters_helper.dart	85.18%	4 Missing ⚠️
test/api_prices_test.dart	96.92%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
+ Coverage   75.99%   76.33%   +0.33%     
==========================================
  Files         236      239       +3     
  Lines        8391     8494     +103     
==========================================
+ Hits         6377     6484     +107     
+ Misses       2014     2010       -4     

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[monsieurtanuki]

Thank you @teolemon for your review!

I think we're all set now for the MVP regarding prices in Smoothie:

• create/get/delete session
• create/get/delete price
• upload/delete proof

Still not implemented:

• get users (not really helpful in a first approach)
• get proof (but it's somehow embedded in get price)
• get product (but we can do that in "standard" off-dart)
• get locations (but we can use OSM methods and it's somehow embedded in get price)

[monsieurtanuki]

@raphael0202 @raphodn In a first approach I can retrieve my "monoprix daumesnil paris" shop with a nominatim query like https://nominatim.openstreetmap.org/search.php?q=monoprix+daumesnil+paris&format=jsonv2

I can find the same shop with https://prices.openfoodfacts.org/app/add/single

But I cannot get that shop with prices API api/v1/locations (no results).
Am i doing something wrong with api/v1/locations?