Add type parameters to derived record name

[erikvanoosten]

This approach has the advantage of giving each type instance a different name. This is relevant if the consumer of the schema uses code generation. The feature is copied from Avro4s.

For example:

  def main(args: Array[String]): Unit = {
    import vulcan.Codec
    import vulcan.generic._

    case class SomeData(foo: String)
    case class Event[A](data: A)
    implicit val someDataCodec: Codec[SomeData] = Codec.derive
    println(Codec.derive[Event[SomeData]].schema.right.get.toString(true))
  }

Prints: Event.
After applying this pull request it will print: Event__SomeData.

[erikvanoosten]

Closing, this is a duplicate of #444.