LSP: Inlay hints for multiline pipelines

[ascandone]

It would be nice to have inlay hints showing the type of each line in a pipeline expression (that span across multiple lines)

This is the way this is shown in Rust:

I have a working POC in this PR

Open questions

1. in a a |> f() |> ... |> g() expression, should we show a's type? (Rust shows it)
   1. should we show it even if the value if a simple literal (e.g. string or int)?
   2. should we show it even if the value is a variable whose type is a type with the same name? (e.g. html: Html)

Previous attempts

#2319, #2393, #2525

[lpil]

Sounds good! One thing I want to make sure is that we don't make it too overwhelming with too much information.

should we show it even if the value if a simple literal (e.g. string or int)?

Let's not show it.

should we show it even if the value is a variable whose type is a type with the same name? (e.g. html: Html)

Yes