Unhelpful hover information for list literals

[jiribenes]

When hovering on records, the language server usually provides useful details. Unfortunately, because list literals are immediately desugared into applications of Cons and Nil, the language server shows details about Cons or Nil on hover:

Sometimes the displayed information is for Cons no matter to which point of the list literal one points, in other cases, the displayed information is for Nil.

The code handling for showing hover information is here: https://github.com/effekt-lang/effekt/blob/master/effekt/shared/src/main/scala/effekt/Intelligence.scala#L144-L150