Support Scala 3 wildcard and renaming imports under -Xsource:3

[smarter]

Instead of:

import foo._

One can now write:

import foo.*

and instead of:

import foo.{bar => baz}

One can now write:

import foo.{bar as baz}

As well as:

import foo.bar as baz

This will let us deprecate the old syntax in a future release of Scala
3 (it's currently only deprecated under -source future).

See http://dotty.epfl.ch/docs/reference/changed-features/imports.html for
details but note that unlike Scala 3 this commit does not implement
support for:

import java as j

As that would require deeper changes in the compiler.

[hmemcpy]

Sorry for bumping this issue, I just noticed that this doesn't work in 2.13.6:

import scala.util.{Try, *}

I'm getting the error: object * is not a member of package util

This compiles just fine in Scala 3.

Is this a limitation of -Xsource:3 or a possible bug?

[smarter]

@hmemcpy This is fixed in #9639

[hmemcpy]

Ah, cheers! Was this released?
I'm asking because IntelliJ's latest EAP is currently offering this refactoring for -Xsource:3 users during "optimize usings", and it leaves broken code. I was about to report it there, next.

[smarter]

This PR will be part of 2.13.7.

[hmemcpy]

Thanks very much!