Turn block into a command namespace

[schlessera]

The empty block command would be better as a command namespace.

[gemini-code-assist]

Summary of Changes

Hello @schlessera, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant architectural improvement by refactoring the WP-CLI block command into a command namespace. This change streamlines the command structure, making it easier to manage and discover block-related functionalities through a more organized hierarchy. The implementation includes a conditional check for the CommandNamespace class, ensuring robust compatibility across various WP-CLI setups.

Highlights

• Refactored Block Command: The core block command has been refactored to extend WP_CLI\Dispatcher\CommandNamespace, transforming it from a standalone command into a command namespace.
• Improved Command Structure: This change enhances the organization and presentation of block-related subcommands (like block type, block pattern), leading to clearer help screens and a more intuitive user experience.
• Conditional Registration: The block command's registration as a namespace is now conditional, ensuring compatibility with environments where the CommandNamespace class might not be available.

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[gemini-code-assist]

Code Review

This pull request refactors the block command to be a command namespace, which improves the help screen output on modern WP-CLI versions.

My review focuses on ensuring backward compatibility, which seems to be the intent given the conditional checks. I've identified a critical issue that would cause a fatal error on older WP-CLI versions and provided a fix. I've also suggested an improvement to the command registration logic to ensure a consistent and helpful experience across all versions.

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