Extract error message handling to _error_handling module

[adamtheturtle]

Summary

Move the error message mapping logic from commands.py to a new _error_handling.py module and expose it as a public get_error_message function. This allows other CLI modules to reuse the same error handling logic.

Changes

• Created src/vws_cli/_error_handling.py with the extracted error message function
• Updated src/vws_cli/commands.py to import and use the new module
• Removed unused imports from commands.py

Test plan

• Imports work correctly
• Pre-commit hooks pass
• Error messages remain unchanged

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Note

Low Risk
Pure refactor that centralizes error-message mapping; behavior should remain the same aside from potential import/path issues.

Overview
Extracts VWS exception-to-message formatting from commands.py into a new vws_cli/_error_handling.py module as get_error_message.

commands.py now imports and uses get_error_message in _handle_vws_exceptions, and removes the inlined helper plus now-unused exception/import types.

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