v1.0.1 of data_gov_gr

Unofficial Dart SDK for Greek Government Open Data (data.gov.gr). Changelog excerpt: ### Added - Complete public API documentation (///doc comments) across all models, services, clients, exceptions, and utility classes. ### Changed - Upgraded package dependencies to their latest stable versions (dio_cache_interceptor, dio_smart_retry, freezed_annotation, rxdart, freezed, lints). - Corrected package repository, homepage, and issue tracker URLs in pubspec.yamlto point to the active GitHub repository. ### Fixed - Fixed insecure link to LICENSE in README.md. - F[...]