WIP cross-build to sbt 2.x

[bjaglin]

https://www.scala-sbt.org/2.x/docs/en/changes/migrating-from-sbt-1.x.html
https://github.com/sbt/sbt/wiki/sbt-2.x-plugin-migration

• [2.x] Missing implementation of Def.inputTaskDyn sbt/sbt#7707

  [error] -- [E008] Not Found Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:380:34 
  [error] 380 |    InputTask.createDyn(InputTask.initParserAsInput(scalafixParser))(
  [error]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  [error]     |       value initParserAsInput is not a member of object sbt.InputTask

• [error] -- [E189] Not Found Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:246:13 
  [error] 246 |        case Value(v: UpdateReport) => v
  [error]     |             ^^^^^
  [error]     |             no pattern match extractor named Value was found
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E007] Type Mismatch Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:439:34 
  [error] 439 |          .flatMap(_.get(moduleID.key))
  [error]     |                         ^^^^^^^^^^^^
  [error]     |     Found:    (sbt.Keys.moduleID.key :
  [error]     |       sbt.internal.util.AttributeKey[sbt.librarymanagement.ModuleID])
  [error]     |     Required: sbt.internal.util.StringAttributeKey
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E007] Type Mismatch Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:445:8 
  [error] 445 |        projectDepsExternal,
  [error]     |        ^^^^^^^^^^^^^^^^^^^
  [error]     |        Found:    (projectDepsExternal : Seq[String])
  [error]     |        Required: Seq[sbt.ModuleID]
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E007] Type Mismatch Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:446:8 
  [error] 446 |        projectDepsInternal,
  [error]     |        ^^^^^^^^^^^^^^^^^^^
  [error]     |Found:    (projectDepsInternal : Seq[java.io.File | xsbti.HashedVirtualFileRef])
  [error]     |Required: Seq[sbt.File]
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E008] Not Found Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:519:60 
  [error] 519 |            (config / dependencyClasspath).value.map(_.data.toPath) :+
  [error]     |                                                     ^^^^^^^^^^^^^
  [error]     |            value toPath is not a member of xsbti.HashedVirtualFileRef

• [error] -- [E049] Reference Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:654:31 
  [error] 654 |      implicit val argFormat = liftFormat(argWriter)
  [error]     |                               ^^^^^^^^^^
  [error]     |      Reference to liftFormat is ambiguous.
  [error]     |      It is both imported by import sjsonnew._
  [error]     |      and imported subsequently by import sjsonnew.BasicJsonProtocol._
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E045] Cyclic Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixPlugin.scala:654:42 
  [error] 654 |      implicit val argFormat = liftFormat(argWriter)
  [error]     |                                          ^
  [error]     |                           Recursive value argWriter needs type
  [error]     |
  [error]     |                            Run with -explain-cyclic for more details.
  [error]     |
  [error]     | longer explanation available when compiling with `-explain`

• [error] -- [E007] Type Mismatch Error: /home/brice/git/scala/sbt-scalafix/src/main/scala/scalafix/sbt/ScalafixTestkitPlugin.scala:51:54 
  [error] 51 |            scalafixTestkitInputClasspath.value.map(_.data),
  [error]    |                                                    ^^^^^^
  [error]    |                       Found:    (_$1.data : xsbti.HashedVirtualFileRef)
  [error]    |                       Required: java.io.File
  [error]    |
  [error]    | longer explanation available when compiling with `-explain`

[bjaglin]

This was picked as significant indentation by the compiler (and has been also all along by scalafmt, as scala3 is aggressively/incorrectly used on all files as dialect), which was causing latestAvailable's type to be recursive ...