feat(lookml): add single-file push and pull options

[bwebs]

Summary

Adds single-file synchronization support to lkr tools lookml push and lkr tools lookml pull.

• Added --file / -f options to both commands.
• push: Syncs only the specified file and skips remote orphan deletion. Also supports passing a single file path directly as the positional argument.
• pull: Pulls only the specified file and skips local orphan deletion.
• Added comprehensive unit tests for single-file push and pull operations.
• Added --version option to CLI.

[gemini-code-assist]

Code Review

This pull request introduces a --version option to the main CLI and adds support for pushing and pulling a single file via a new --file / -f option in the lookml tools. The review feedback highlights critical issues in the single-file implementation: a bug in push where passing a file as the main argument duplicates the directory prefix, a path traversal vulnerability in the push command, and a path resolution/traversal issue in the pull command.

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