feat(statistics): add Statistical Classifications feature and refactor imports with barrel files

[ryanaidilp]

Status

READY

Description

I propose enhancing the FLUTTER STADATA SDK with a new feature that allows users to fetch Statistical Classifications (KBLI & KBKI) data from the BPS (Badan Pusat Statistik) API. This enhancement will empower developers using the SDK to access and incorporate statistical classification data into their Flutter applications seamlessly.

Key Changes:

• Implemented a new function/method in the SDK to retrieve Statistical Classifications (KBLI & KBKI) data from the BPS API.
• Developed comprehensive unit tests for the newly added function/method to ensure its accuracy and reliability.
• Maintained a test coverage of no less than 90% for the newly introduced feature.
• Updated the SDK's documentation to include instructions on how to use the new feature, complete with illustrative examples.
• Refactored the code to use barrel files for efficient file import.

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

Related Issues

I open a pull request for these issues: #24, #64

[codecov]

Codecov Report

Attention: Patch coverage is 85.77406% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 96.48%. Comparing base (ee80219) to head (c7e3b8f).

Files	Patch %	Lines
...on/data/models/statistic_classification_model.dart	59.32%	24 Missing ⚠️
...ication/data/models/classification_item_model.dart	60.00%	4 Missing ⚠️
...ata_flutter_sdk/lib/src/core/base/base_entity.dart	62.50%	3 Missing ⚠️
...s/statistic_classification_remote_data_source.dart	94.59%	2 Missing ⚠️
...a_flutter_sdk/lib/src/core/helper/date_helper.dart	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #65      +/-   ##
===========================================
+ Coverage    96.03%   96.48%   +0.45%     
===========================================
  Files           88      100      +12     
  Lines         1310     1535     +225     
===========================================
+ Hits          1258     1481     +223     
- Misses          52       54       +2     

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