Derive pureconfig.ConfigReader for A and for its fields recursively with pureconfig-magnolia

This differs from just using pureconfig.module.magnolia.auto.reader.exportReader by using different configuration, defined in PureconfigInstances, specifically:

1. Field name remapping is disabled, camelCase fields will remain camelCase, not kebab-case 2. Sealed traits are rendered as in circe, using a wrapper object with a single field, instead of using a type field. Example:

sealed trait AorB
final case class A(a: Int) extends AorB
final case class B(b: String) extends AorB

final case class Config(values: List[AorB])

in config:

config {
  values = [
    { A { a = 123 } },
    { B { b = cba } }
  ]
}