Add 'augur test models' command alias with improved argument handling

[ManuelKugelmann]

Summary

This change adds support for the augur test models command as an alternative to the existing augur testmodels command, while maintaining backward compatibility and improving argument handling.

Key Changes

• Added test as an alternative command trigger alongside testmodels for the model testing functionality
• Implemented validation to ensure augur test is only used with the models subcommand, displaying usage information if called incorrectly
• Updated argument passing logic to correctly handle the different command formats:
  • augur testmodels [args] passes arguments starting from position 2 (${@:2})
  • augur test models [args] passes arguments starting from position 3 (${@:3}) to skip the "models" keyword
• Maintained full backward compatibility with the existing augur testmodels command

Implementation Details

• The validation check ensures users get clear feedback if they attempt to use augur test without the models subcommand
• Conditional logic branches based on which command format was used to correctly offset the argument array when invoking the Python test script
• All existing functionality and configuration file requirements remain unchanged

https://claude.ai/code/session_01LEpw5r69g77Gow7vjvNDXJ