Expose add_to_blog, new_role, and blog_id fields in signup list and get

[swissspidy]

Exposes add_to_blog, new_role, and blog_id as available fields for wp user signup list and wp user signup get, and enables filtering by them.

• Unserializes signup meta properties so add_to_blog and new_role are accessible as fields.
• Aliases add_to_blog and blog_id to allow querying and filtering by either name.
• Updates filtering logic in Signup_Command::list_() to support filtering by --new_role, --blog_id, and --add_to_blog.
• Added acceptance test scenarios covering field output and filtering.

Closes #629

[coderabbitai]

Caution

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_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Signup_Command.php	95.23%	1 Missing ⚠️

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