v0.4.7

• bump dependencies for scalafmt, sbt, sbt-scoverage, scalatest, scio-avro, scio-core, sbt-dependency-tree
• adds BigSampler --bigqueryPartitioning CLI arg to configure output BQ table's partitioning #705
• (fix) Respect avro.java.string type #709
• decouple dataflow in ratatool-scalacheck #717
• cleanup beam dependencies #714
• migrate pure scalatest to scalatest + scalacheck #708