Cli retrieve unknown args

[kschwab]

Fixes #582

[hyperlint-ai]

PR Change Summary

Enhanced CLI argument handling by allowing retrieval of unknown arguments.

• Updated documentation to reflect changes in handling unknown CLI arguments.
• Introduced the CliUnknownArgs annotation for retrieving ignored arguments.
• Modified example code to demonstrate the new functionality.

Modified Files

• docs/index.md

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[hramezani]

Thanks @kschwab