Fix Metals compat

Author: adpi2

modules/core/src/main/java/ch/epfl/scala/debugadapter/internal/PartialLaunchArguments.java

@@ -0,0 +1,5 @@
+package ch.epfl.scala.debugadapter.internal;
+
+class PartialLaunchArguments {
+  public boolean noDebug = false;
+}

modules/core/src/main/scala/ch/epfl/scala/debugadapter/internal/DebugSession.scala

@@ -148,7 +148,10 @@ private[debugadapter] final class DebugSession private (
         context.configure(tools)
         super.dispatchRequest(request)
       case "launch" =>
-        val launchArgs = JsonUtils.fromJson(request.arguments, classOf[LaunchArguments])
+        val command = Command.parse(request.command)
+        // the launch args sent by Metals do not conform to the LaunchArgument of java-debug
+        // here we parse to PartialLaunchArguments which only contains noDebug
+        val launchArgs = JsonUtils.fromJson(request.arguments, classOf[PartialLaunchArguments])
         val tools =
           if (launchArgs.noDebug) DebugTools.none
           else DebugTools(debuggee, resolver, logger)