Show type in completion details

[pfitzseb]

and hover.

ToDo:

• Tests
• improve completion_kind heuristics

[fredrikekre]

Tested your example in neovim:

Would be nice to get both fields to show the same kind?

The details look very strange:

Hover looks like in your example:

But completion details again look strange:

[pfitzseb]

You wanna give this another go, @fredrikekre ? I didn't fix anything related to CompletionKinds yet (well, except for removing the Enum fallback; anything else requires a deep dive into SymbolServer and I don't have the time for that atm), but completions should already be more helpful.

[fredrikekre]

Looks good, the strange double type things are gone (x::Int::Int64 etc).