Metals: Local type aliases not detected in goto implementation

[tgodzik]

Describe the bug

ImplementationLspSuite.scala

check(
    "type-local",
    """|/a/src/main/scala/a/Main.scala
       |object Test {
       |  def main {
       |    class @@A
       |    class <<B>> extends A
       |    type C = A
       |    class <<D>> extends C
       |  }
       |}
       |""".stripMargin
  )

=> Diff (- obtained, + expected)
     type C = A
-    class D extends C
+    class <<D>> extends C
   }

Search terms
implementation search type alias

[ckipp01]

Just so someone else doesn't grab this, @eilite has been looking at this, and will shoot in a pr.

[tgodzik]

Closed via https://github.com/scalameta/metals/pull/1598