Move JavaScript Controllers to javascript Folder, Configure ESLint, and Create rbui-js NPM Package

[cirdes]

This PR includes the following changes:

1. Move JavaScript Controllers:

   • Inspired by the Stimulus Reflex project, all JavaScript controllers from the phlex_ui_stimulus project have been moved to a new javascript folder. This restructuring enhances developer experience by consolidating Ruby and JavaScript code in a single project. Additionally, it sets the groundwork for creating generators that can eject components with both Ruby and JavaScript code in the future.

2. ESLint Configuration:

   • Configured the ESLint project to improve the quality of our JavaScript code. This helps maintain consistent coding standards and catch potential issues early in the development process.

3. Creation of rbui-js NPM Package:

   • Created a new npm package named rbui-js. This package will allow us to publish our JavaScript code and marks the beginning of the transition to the new project name.

[cirdes]

We decided not to have a JavaScript folder and to keep the JS close to RB components, as suggested in this guide.