feat: Add flexibility to PriceTotalStats

[AshutoshKhadse23]

Closes: #1058

Added all 50 fields.
And provide the flexibility.
This is how it will look :

final stats = PriceTotalStats.fromJson(jsonData);

final priceCount = stats.priceCount;

final someNewField = stats.getInt('some_new_field');

if (stats.containsKey('another_new_field')) {
  final value = stats.getString('another_new_field');
}

final allKeys = stats.availableKeys;

[monsieurtanuki]

Hi @AshutoshKhadse23!
As you may have already understood from openfoodfacts/smooth-app#6553, your solution is a bit too complex.
Let's focus on openfoodfacts/smooth-app#6553 first.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.87097% with 51 lines in your changes missing coverage. Please review.

Project coverage is 75.54%. Comparing base (820d145) to head (1e78f3b).
Report is 102 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/prices/price_total_stats.g.dart	71.42%	28 Missing ⚠️
lib/src/prices/price_total_stats.dart	11.53%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
- Coverage   76.34%   75.54%   -0.81%     
==========================================
  Files         239      264      +25     
  Lines        8494    10031    +1537     
==========================================
+ Hits         6485     7578    +1093     
- Misses       2009     2453     +444     

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[AshutoshKhadse23]

@monsieurtanuki ,
I tried the simpler approach but was having issues with the autogenerated file price_total_stats.g.dart

[monsieurtanuki]

@monsieurtanuki , I tried the simpler approach but was having issues with the autogenerated file price_total_stats.g.dart

@AshutoshKhadse23 Good news: we don't need price_total_stats.g.dart and JsonSerializable in that specific case.
More generally speaking, we're sort of migrating to a less strict structure, cf. #1056. We need more flexibility.

[AshutoshKhadse23]

@monsieurtanuki ,
I’ve updated the code with a simpler approach, removing price_total_stats.g.dart and JsonSerializable as they’re no longer needed.

[monsieurtanuki]

Thank you @AshutoshKhadse23!

The point of the issue was to provide flexibility, and with a visible json field we have all the flexibility we need.

The getInt method makes sense too, as it's frequently used.

My initial thought was to use constants (or methods) as tags, and no getters. Another solution is to implement all getters.
You implemented both, with is more than enough.

I think we'd be better off with the getters and without the constants.
What do you think of it?

[AshutoshKhadse23]

@monsieurtanuki, I agree with you and changed the code with the getters and without the constants.

[monsieurtanuki]

Thank you @AshutoshKhadse23, and congratulations for your first PR in this specific project!