Add scalafmt plugin to scala-sttp4-jsoniter client generator #47

Job	Run time
Build sbt/Scala (samples/client/petstore/scala-akka)	1m 8s
Build sbt/Scala (samples/client/petstore/scala-pekko)	1m 2s
Build sbt/Scala (samples/client/petstore/scala-sttp4-jsoniter)	1m 6s
Build sbt/Scala (samples/client/petstore/scala-sttp4)	1m 4s
Build sbt/Scala (samples/client/petstore/scala-sttp-circe)	1m 7s
Build sbt/Scala (samples/client/petstore/scalaz)	1m 8s
Build sbt/Scala (samples/client/petstore/scala-sttp)	57s
Build sbt/Scala (samples/client/petstore/scala-http4s)	1m 11s
	8m 43s

Provide feedback