import ReplDriver from dotty so that we can modify it (later) (#62)

This PR only imports (and renames) it, the modifications will come in separately. 
It's split into a few commits to hopefully simplify future rebasing, so we'll not squash this PR.

* import dotty ReplDriver: 1) carbon copy
* import dotty ReplDriver: 2) no need to copy State also
* import dotty ReplDriver: 3) carbon copy of Rendering
* import dotty ReplDriver: 4) rename ReplDriver and Rendering
* import dotty ReplDriver: 5) move ReplDriver and Rendering into our package

core/src/main/scala/replpp/DottyRandomStuff.scala

@@ -0,0 +1,30 @@
+package replpp
+
+import dotty.tools.dotc.reporting.{HideNonSensicalMessages, StoreReporter, UniqueMessagePositions}
+import dotty.tools.repl.*
+
+/** random code that I needed to copy over from dotty to make things work, usually because it was `private[repl]`
+ */
+private[replpp] object DottyRandomStuff {
+
+  /** Create empty outer store reporter
+   * copied from https://github.com/lampepfl/dotty/blob/3.3.0-RC5/compiler/src/dotty/tools/repl/package.scala#L6  */
+  def newStoreReporter: StoreReporter = {
+    new StoreReporter(null) with UniqueMessagePositions with HideNonSensicalMessages
+  }
+
+  /** copied from https://github.com/lampepfl/dotty/blob/3.3.0-RC5/compiler/src/dotty/tools/repl/ParseResult.scala#L130 */
+  object ParseResult {
+    val commands: List[(String, String => ParseResult)] = List(
+      Quit.command -> (_ => Quit),
+      Quit.alias -> (_ => Quit),
+      Help.command -> (_ => Help),
+      Reset.command -> (arg => Reset(arg)),
+      Imports.command -> (_ => Imports),
+      Load.command -> (arg => Load(arg)),
+      TypeOf.command -> (arg => TypeOf(arg)),
+      DocOf.command -> (arg => DocOf(arg)),
+      Settings.command -> (arg => Settings(arg)),
+    )
+  }
+}