Pass the function signature in the detail property of the completion item instead of the label

Based on the gif in the README and the snapshots in https://github.com/Microsoft/vscode/issues/29126#issuecomment-432262123, it looks like this extension is appending the function signature to the function name in the label of the completion item.

This makes the reading of the items hard, especially when the docs are expanded to the side (Hit Ctrl+Space to show/hide the docs once the suggest widget is open)

The CompletionItem has a property called detail. Most extensions use this property to pass the signature. Below is a typsescript example:

I understand the temptation to include the signature as part of the label. It allows the user to choose the right item from the list at a glance. But this is only possible when the function name is small and docs are collapsed. Else, it just adds noise

Start by tracing where this extension constructs VS Code CompletionItem objects, using the CompletionItem API documentation and the completion UI shown in the issue. Move the function signature from the item label to its detail property, then verify with Ctrl+Space that labels are cleaner while the signature remains visible in the expanded documentation.