Adding -source:future causes compilation errors due to unsupported wildcard syntax

[arixmkii]

Reopens #496

To address wildcards mentioned in #496 (comment)

This has been promoted to error even in the current LTS.

Example:

//> using scala 3.3.6
//> using option -source:future

import scala.collection.mutable._

@main
def main = println(ListBuffer())

Running it with scala-cli

% scala-cli Underscore.scala
Compiling project (Scala 3.3.6, JVM (25))
[error] ./Underscore.scala:4:33
[error] `_` is no longer supported for a wildcard import; use `*` instead
[error] This construct can be rewritten automatically under -rewrite -source future-migration.
[error] import scala.collection.mutable._
[error]                                 ^
Error compiling project (Scala 3.3.6, JVM (25))
Compilation failed

[arixmkii]

Compiling smithy parts as a separate module w/o -source:future would be a workaround, but updated code gen support for this feature toggle is still appreciated.

[kubukoz]

I agree, it should be handled by the codegen.

If you'd like to contribute support, it'd be building up on the solution for #496 (#736)