Add WP CLI commands for Caching & Skip404

[arunshenoy99]

Proposed changes

This PR introduces WP-CLI commands for managing Caching and Skip404 settings, giving us more control over toggling features via the CLI. I also standardized some naming conventions, improved the code structure and fixed a few bugs.

Structure

wp nfd performance cache <command> <value>

Set Cache Level

wp nfd performance cache level <0|1|2|3>

Toggle Skip 404 Handling

wp nfd performance cache skip_404 <true|false>

Set Cache Exclusions

wp nfd performance cache exclude "<comma-separated-values>"

Type of Change

Production

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update
• Refactoring / housekeeping (changes to files not directly related to functionality)

Development

• Tests
• Dependency update
• Environment update / refactoring
• Documentation Update

Video

Checklist

• I have read the CONTRIBUTING doc
• I have viewed my change in a web-browser
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments