Add wp theme cache command

[Copilot]

• Create Theme_Cache_Command.php class with clear and flush methods
• Register 'theme cache' command in extension-command.php
• Add Behat tests for theme cache commands
• Update phpcs.xml.dist to exclude Theme_Cache_Command from prefix rule
• Update composer.json with new commands
• Verify code passes linting, code style, and static analysis checks
• Run code review and security checks
• Use WP_Theme::cache_delete() method instead of manual cache key construction
• Implementation complete and ready for review

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add wp theme cache command</issue_title>
<issue_description>## Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

Add the following commands

wp theme cache <theme> get <key> wp theme cache <theme> add <key> <data>
wp theme cache <theme> delete

Describe the solution you'd like

Add command would map to the method cache_add on WP_Theme class.
Get command would map to the method cache_get on WP_Theme class.
Delete command would map to the method cache_delete on WP_Theme class.

This would help manage and clear theme related caches.

</issue_description>

Comments on the Issue (you are @copilot in this section)

@danielbachhuber I amenable to this. Feel free to submit a pull request, if you'd like. Here is some [guidance on our pull request best practices](https://make.wordpress.org/cli/handbook/contributions/pull-requests/). @swissspidy `WP_Theme::cache_add()` and `WP_Theme::cache_get()` are private, so we can't really use these.

The delete method is public, but maybe this could be used via wp cache delete and wp cache flush-group? The cache key property itself is also private though, so we can't really access it.</comment_new>

• FixesAdd wp theme cache command #392

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