config_loader library

1. environment_config package
2. documentation
3. config_loader.dart

environment_config package

1. Libraries
2. argument_parser
3. config
4. errors/config_error
5. config_field_type
6. config_generator
7. config_loader
8. errors/extension_not_found_error
9. field_config
10. errors/file_not_found_error
11. generator
12. errors/malformed_config_error
13. platform_value_provider
14. errors/validation_error