Modal width

For those who don't know how to use modal attributes. You can add option opts.attributes to modal's open method as below.

const modal = editor.Modal;
const opts = {
       attributes: { class:'my-custom-class', id:'my-custom-id' }
}
modal.open(opts);

Because I didn't find how to use it in the documentation here.

OK, what I'm thinking is to create a function to be able to set the width like: setWidth('400px'), and also a method to set custom attributes: setAttributes({'data-custom-attribute': 123}).

I think 2 functions are needed because the width is controlled by CSS, and so is the modal's design, so just letting the user set the width is good enough in this case. The attribute function would be for any other case that's needed

What do you think?

Hello, sorry I'm piled with work now, if @sunnykgupta can give this a shot it would be great.