build: Add scalaFmt

.scalafmt.conf

+version = "3.8.3"
+maxColumn = 90
+runner.dialect = scala3
+rewrite.scala3.convertToNewSyntax = yes
+rewrite.scala3.removeOptionalBraces = yes
+rewrite.scala3.removeEndMarkerMaxLines = 16384
+newlines.source = keep
+docstrings.wrapMaxColumn = 80
+docstrings.oneline = fold
+
+project {
+  excludePaths = [
+  ]
+}

project/plugins.sbt

+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.0")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")