Build POT files for plugins and themes from project root

[Clorith]

Short introduction

This introduces a NPM, and subsequent Turbo command for running i18n:make-pot across all plugins and themes in a project, to allow individual translation files to be prepared quickly, efficiently, and hopefully reliably!

Description

This introduces a new i18n:make-pot command to the package.json, and composer.json files within the project, which Turbo can run to generate POT files, the base file used for translations.

It also modifies the existing composer run make-pot command to take the text domain and domain path (language folder) as a base to avoid the need for manually declaring paths, and allowing the commands to be copied easily between plugins and themes.

Steps to test / reproduce

• npm run i18n:make-pot
• Watch as packages/block-themelanguagesblock-theme.pot is generated
• Validate that it contains the translatable strings.