Fix generated code on Scala 3

[mrdziuban]

I was testing out scalaxb with sbt 2 and found that it generated invalid code:

trait BasicHttpBinding_IMyServiceBindings { this: scalaxb.Soap11ClientsAsync & scalaxb.HttpClientsAsync =>
  
  lazy val targetNamespace: Option[String] = Some("http://example.com/schemas/myervice")
  lazy val service: com.example.generated.IMyService = new BasicHttpBinding_IMyServiceBinding {}
  def baseAddress = new java.net.URI("https://example.com/MyService.svc")

  trait BasicHttpBinding_IMyServiceBinding extends com.example.generated.IMyService {
    import scalaxb.ElemName._
    def exampleOperation(message: com.example.generated.MessageType)(implicit ec: ExecutionContext): Future[com.example.generated.ResponseType] = 
                    case x => x
          })
  }
}

Note that the body of exampleOperation is missing a lot of what's supposed to be there, the only thing that makes it is

                      case x => x
            })

I think this has to do with significant whitespace/indentation in Scala 3, but it still happens even when setting the -no-indent scalac option.

Instead what does work is using format to interpolate all arguments, rather than combining it with string concatenation.

[eed3si9n]

Thanks!