#10696 Complete createStatusBarItem in window namespace from VSCode API

[ndoschek]

What it does

This PR adds the missing createStatusBarItem overload in window namespace from VSCode API

• Add createStatusBarItem overload in theia.d.ts to allow an item id as argument
• Extend createStatusBarItem implementation in plugin-context
• Adapt createStatusBarItem in status-bar-message-registry
• Adapat StatusBarItemImpl to accept external ids

Contributed on behalf of STMicroelectronics

Signed-off-by: Nina Doschek [email protected]

Fixes #10696

How to test

1. Start the Theia browser example (which includes the vscode-builtin-json extension)
2. Add a JSON file to your workspace that produces a schema resolution error. E.g. this snippet:

{
    "$schema": "http://invalid-schema-url"
}

3. The extension should still add a status bar item (warning symbol) with the title Unable to resolve schema. Click to retry. on the right area of the Theia status bar.

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[msujew]

The changes are looking good to me!

• The existing JSON status bar item continues to work correctly
• Using the overload to create a status bar item should work as well

I have a nitpick regarding the changed headers.