Replaces the 'services' module with a 'clients' module for generated client code, and moves exception handling to a separate 'exceptions.py' at the package root. Updates code generation logic, templates, and model definitions to support this new structure, improving clarity and modularity of generated packages.

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This commit removes legacy service and HTTP client templates, introduces a dedicated exception_generator module, and updates the codebase to generate exceptions as a separate package module. The ConversionResult model now supports multiple exception modules, and the output structure is updated to place exceptions in their own subpackage. Unused or redundant templates and code paths are removed for clarity and maintainability.

Update project version in pyproject.toml from 2.1.4 to 2.2.0.

Deleted the entire tests/regression directory and test_api_config.py, removing regression and API config tests. Updated test_generate_data.py to check for 'clients' and 'exceptions' directories instead of 'services' and 'api_config.py'. Marked test_service_generator.py and test_service_generator_edges.py as skipped due to the removal of service_generator, reflecting the migration of services to client classes.