feat: show inferred type on holes in hover [skip ci] #21423
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Low hanging fruit after: #21390.
It seems useful to see the inferred "expected" type on holes, so this PR adds them to be visible on hover.
This won't be perfect, as we can't always infer the expected type as we'd like to (see:
InferExpectedTypeSuite#flatmap
, so I'm sure we want to introduce that at all.Side note: Probably we should write something different than
Expression type:
in hover here.cc: @tgodzik