Add `.id` method and `text_editor::focus` task

[sgued]

This functionality adds the ability to programmatically focus a text_editor widget.

• [x] Implemented following the focus handling of the text_input widget.
• [x] Updated an example to make use of the feature

[kiilerix]

This seems to be contributing to existing unnecessary code duplication. I'm exploring some cleanup in https://github.com/iced-rs/iced/pull/2745 .

[IanTerzo]

Just merge this already. We need to be able to focus a text editor.

[Zane-XY]

@hecrj Please merge this, we need the ability to focus the text_editor, can't implement autocompletion for text editor without this.

[airstrike]

@hecrj Please merge this, we need the ability to focus the text_editor, can't implement autocompletion for text editor without this.

Why can't you just copy and paste the text editor into your own app and implement this yourself if you're in a hurry to use this solution?

[Zane-XY]

@airstrike I tried to copy the text_editor.rs into the project and it depends on some private modules, I don't want to end up to copy too many files to my project.

[janTatesa]

Is there any problem with merging this?

[sgued]

I don't think there is much gained by commenting on this PR. Unless you have something to add please just put a :+1: on the top comment, I don't think more comments will help, let's not spam maintainers.