Always show return type/signature for all items in code completion

[RaviKavaiya]

Is it possible to show return type of a method in intellisense (or a complete method signature)?

Sometimes, it is much useful when we have a large number of methods available. And to pick one quickly, this will help much.

For example, in Android Studio, it shows like this:

[DanTup]

We do show the return type in the same place here:

However VS Code only shows it for the highlighted item. There's an open issue about improving this here:

microsoft/vscode#39441

If that is implemented, we should be able to improve this here too.

[DanTup]

Looks like the LSP part of this work will be in v3.17 of the spec.

microsoft/language-server-protocol#1307