Fix asimov snapshot --version

[SamuelSarle]

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@artob	1

Your contribution is much appreciated with a final score of 1!
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[artob]

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Pull Request Overview

This PR fixes an issue where calling the --version flag was causing errors by making the command subcommand optional in the CLI argument parser.

• Made the command field optional in the CLI options struct
• Added unwrap() when accessing the command to handle the optional case