Developed a plugin to group toolbar items

[dashingswags]

This package contains CKEditor 5 features allowing to group multiple toolbar items in a dropdown list using any custom ckeditor5 build

1. Add "toolbargroup" to the toolbar.items array as shown below
2. add a toolbarGroup object to the editor.config and set the required parameters.

The toolbarGroup accepts an option array with a model and title property respectively.

Values for the model is same as toolbar.items array, while the values for the title is optional. if you want a custom title, then you can set that option as desired

[Reinmar]

Hi! This PR is really amazing – thank you for sharing it!

I started analyzing in #1472 what we really need, though, and I'm not sure if this is the right way to propose this functionality. And what kind of functionality we need. I'll keep your PR open for the time being, before my colleagues comment on this, but I'm afraid we'll need to implement it in a different way. Still, your plugin is very interesting and I'd love to see it on npm – I'm sure other developers will enjoy using it.

[Reinmar]

My late review landed in #1472 (comment). As I explained there, such a feature that you proposed would make a great sense as a 3rd party addon. Thanks again for the great PR, but we'd like to go in a different direction with the core.