Return applicable ranges for hover requests #1488
Description
Noted from #1476, quick info/hovers currently lack a range field.
The best I can tell, the range is not necessarily an "applicable" range to avoid making the same request over and over - but it is used at least for visual indications on what the hover corresponds to.
I think without that, editors just guess at the current word.
An implementation here should be inspired by the start and end we set in QuickInfoResponseBody from the old codebase.