add simplified autocomplete logic for addon authors about ember-language-server

[lifeart]

@knownasilya sorry for long delay, missed notification, yes, I think it's possible.
Also, this proposal may be implemented as side UELS addon (for POC)

[knownasilya]

Could this support the scenario where components are placed lower in a tree and the autocomplete would change if you were down that tree and had some components above but if you changed where you were in the tree the list would update since you now have access to other components?

[lifeart]

https://github.com/microsoft/vscode-extension-samples/tree/master/custom-data-sample may be used as ref
https://github.com/microsoft/vscode-custom-data

[knownasilya]

That's sweet