feat: Add a new phpcs command to run phpcs analysis

[plopesc]

While installing and testing the plugin though that phpcs command could b ea good addition.

If you find it useful, I could work on other code quality commands, like phpstan or eslint.

Thank you for the great job made in this extension.

[justafish]

That's cool! Yeah it'd be great to have other commands, and maybe a singular lint to run all the static code analysis tools

Holding off on merging this until I can test it, but it looks good from a glance

[plopesc]

Let me rename this one as lint:phpcs and I'll work on the others in this same MR if you're OK with it.