move ServerHandler to internal per review

main-command/src/main/scala/sbt/BasicKeys.scala

@@ -10,6 +10,7 @@ package sbt
 import java.io.File
 import sbt.internal.util.AttributeKey
 import sbt.internal.inc.classpath.ClassLoaderCache
+import sbt.internal.server.ServerHandler
 import sbt.librarymanagement.ModuleID
 import sbt.util.Level
 

main-command/src/main/scala/sbt/internal/server/ServerHandler.scala

@@ -6,6 +6,8 @@
  */
 
 package sbt
+package internal
+package server
 
 import sjsonnew.JsonFormat
 import sbt.internal.protocol._

main/src/main/scala/sbt/Defaults.scala

@@ -26,7 +26,12 @@ import sbt.internal.librarymanagement.mavenint.{
   PomExtraDependencyAttributes,
   SbtPomExtraProperties
 }
-import sbt.internal.server.{ LanguageServerReporter, Definition, LanguageServerProtocol }
+import sbt.internal.server.{
+  LanguageServerReporter,
+  Definition,
+  LanguageServerProtocol,
+  ServerHandler
+}
 import sbt.internal.testing.TestLogger
 import sbt.internal.util._
 import sbt.internal.util.Attributed.data

main/src/main/scala/sbt/Keys.scala

@@ -42,6 +42,7 @@ import sbt.internal.{
 }
 import sbt.io.{ FileFilter, WatchService }
 import sbt.internal.io.WatchState
+import sbt.internal.server.ServerHandler
 import sbt.internal.util.{ AttributeKey, SourcePosition }
 
 import sbt.librarymanagement.Configurations.CompilerPlugin

main/src/main/scala/sbt/Project.scala

@@ -45,6 +45,7 @@ import sbt.internal.{
 import sbt.internal.util.{ AttributeKey, AttributeMap, Dag, Relation, Settings, ~> }
 import sbt.internal.util.Types.{ const, idFun }
 import sbt.internal.util.complete.DefaultParsers
+import sbt.internal.server.ServerHandler
 import sbt.librarymanagement.Configuration
 import sbt.util.{ Show, Level }
 import sjsonnew.JsonFormat

sbt/src/server-test/handshake/build.sbt

@@ -1,3 +1,5 @@
+import sbt.internal.ServerHandler
+
 lazy val root = (project in file("."))
   .settings(
     Global / serverLog / logLevel := Level.Debug,