Update to 1.58 and take advantage of the new completion labels

[333fred]

https://code.visualstudio.com/updates/v1_58#_detailed-completion-item-labels

Should let us display more info for types of things and the namespace import completions will bring in. Related to microsoft/vscode#39441.

[333fred]

@david-driscoll these are also in the 3.17 draft LSP spec (https://microsoft.github.io/language-server-protocol/specifications/specification-3-17/#completionItemLabelDetails), so we could do similar for LSP in general when clients support it.

[JoeRobich]

It is neat in the TypeScript completion that you can see the member declaration inlined.

[333fred]

It is neat in the TypeScript completion that you can see the member declaration inlined.

For this, btw, we'll need new Roslyn APIs. Currently, that's a section in the documentation that's retrieved by the resolve step, and I don't want to try and resolve all documentation for every completion item on completion list pop.