chore: hardcodes export-application-global

[Pixelik]

Chore

export-application-global #273

• removes ember-export-application-global dependency
• creates export-application-global initializer
• adds @ember/string dependency (used by the above initializer) as it's no longer available in Ember 5 internally
• adds relevant tests
• updates documentation

Details

ember-cli/ember-export-application-global has been deprecated and archived. But an exported application global is essential to an embedded SPA and therefore to ember-cli-embedded as well. So rather than adding a deprecated/archived module as a dependency to this addon, or to an app using this addon, this commit now hardcodes the export-application-global initializer into the ember-cli-embedded module itself, therefore removing the need for an external dependency

Behaviour

• An application global will be exported and attached to the window, without the need to set { exportApplicationGlobal: true } in config/environment.js, as long as { embedded: delegateStart: true } is set in config/environment.js
• To avoid breaking changes with existing config/environment.js files, { exportApplicationGlobal: false } will still work, even though there is no need for it

screenshots of updated docs:

[Pixelik]

Let me know if you agree with this.
I had some issues with the Typescript linter which I ignored.
I will write a test for this if you agree to move forward with this.
🙏 🙂