Handle Large Type Hierarchies

[RD-100]

Reference: Discord Discussion

The library currently can't handle a scenario where there are more than 64 subtypes in a sum type.

Reproduce issue as follows:

import zio.json.{DeriveJsonCodec, JsonCodec}

sealed trait A extends Product with Serializable

object A {
  case object B1 extends A
  case object B2 extends A
  case object B3 extends A
  case object B4 extends A
  case object B5 extends A
  case object B6 extends A
  case object B7 extends A
  case object B8 extends A
  case object B9 extends A
  case object B10 extends A
  case object B11 extends A
  case object B12 extends A
  case object B13 extends A
  case object B14 extends A
  case object B15 extends A
  case object B16 extends A
  case object B17 extends A
  case object B18 extends A
  case object B19 extends A
  case object B20 extends A
  case object B21 extends A
  case object B22 extends A
  case object B23 extends A
  case object B24 extends A
  case object B25 extends A
  case object B26 extends A
  case object B27 extends A
  case object B28 extends A
  case object B29 extends A
  case object B30 extends A
  case object B31 extends A
  case object B32 extends A
  case object B33 extends A
  case object B34 extends A
  case object B35 extends A
  case object B36 extends A
  case object B37 extends A
  case object B38 extends A
  case object B39 extends A
  case object B40 extends A
  case object B41 extends A
  case object B42 extends A
  case object B43 extends A
  case object B44 extends A
  case object B45 extends A
  case object B46 extends A
  case object B47 extends A
  case object B48 extends A
  case object B49 extends A
  case object B50 extends A
  case object B51 extends A
  case object B52 extends A
  case object B53 extends A
  case object B54 extends A
  case object B55 extends A
  case object B56 extends A
  case object B57 extends A
  case object B58 extends A
  case object B59 extends A
  case object B60 extends A
  case object B61 extends A
  case object B62 extends A
  case object B63 extends A
  case object B64 extends A
  case object B65 extends A
  case object B66 extends A
  case object B67 extends A
  case object B68 extends A
  case object B69 extends A
  case object B70 extends A
  case object B71 extends A
  case object B72 extends A
  case object B73 extends A
  case object B74 extends A
  case object B75 extends A
  case object B76 extends A
  case object B77 extends A
  case object B78 extends A
  case object B79 extends A
  case object B80 extends A

  implicit val codec: JsonCodec[A] = DeriveJsonCodec.gen[A]

}


final case class Test(a : A)
object Test{
  implicit val codec: JsonCodec[Test] = DeriveJsonCodec.gen[Test]
}

Test(A.B80)

[guersam]

It affects case classes with more than 64 fields as well.