Add scalafmt plugin to scala-sttp4-jsoniter client generator #48

Job	Run time
Build sbt/Scala (samples/client/petstore/scala-sttp)	58s
Build sbt/Scala (samples/client/petstore/scala-sttp-circe)	1m 6s
Build sbt/Scala (samples/client/petstore/scala-akka)	1m 16s
Build sbt/Scala (samples/client/petstore/scala-pekko)	1m 4s
Build sbt/Scala (samples/client/petstore/scalaz)	1m 14s
Build sbt/Scala (samples/client/petstore/scala-sttp4-jsoniter)	1m 0s
Build sbt/Scala (samples/client/petstore/scala-sttp4)	1m 1s
Build sbt/Scala (samples/client/petstore/scala-http4s)	1m 7s
	8m 46s

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