Add Categories and Checks CLI commands

[ernilambar]

Fixes #303

Command: wp plugin list-check-categories

Output:

Command: wp plugin list-checks

Output:

[ernilambar]

Code is updated as per the comments. New commands will be:

• wp plugin list-checks
• wp plugin list-check-categories

Behat tests implementation for new commands is remaining.

@swissspidy Is it possible to run behat tests in local environment? Or is it implemented now in GitHub actions only?

[swissspidy]

Use composer behat to run the Behat tests.

You may need to run composer prepare-behat-tests once first to create the test database

[ernilambar]

PR ready for review.

• CLI commands updated as per the comments.
• Behat tests added
• Updated PHP Unit tests to reflect new changes.

[ernilambar]

PR has been update as per the review comments.

Note:

• Since PHPMD was generating error, I have added ignore @SuppressWarnings(PHPMD.ExcessiveClassComplexity) in Plugin_Check_Command.
• get_list_check_categories_options() and get_list_checks_options() methods are similar now. But there is some room for enhancements for those listing commands. When we implement those, methods would be different.

[mukeshpanchal27]

In the follow-up PR, it's essential to update the documentation to reflect the changes made by this pull request. Specifically, we removed the Abstract_Check_Runner::register_checks() method. cc. @felixarntz

The affected documentation files that need updating are:

• README.md line 14
• creating-a-static-check.md line 192

[ernilambar]

PR updated as per the comments. Fixed spacing issues and improved function docs.