Get completions from debug adapter in watches pane

[roblourens]

Seems like we could have the same intellisense experience that we have in the console when typing an expression into the watches window

[isidorn]

That would be great, however for completions we need to have an editor. So we would need to render an editor inside a watches pane tree.
This goes into a general direction of replacing all our input boxes with one line editors

fyi @alexandrudima

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