Consumer streams terminate on `F.raiseError` from `EnvelopeDecoder`s

[Daenyth]

This makes it a big pain to use with a parsed type.

Some options were explored in #151, but not completed.

We will want to provide some means to handle those automatically for users, because for example, json decoding using circe is a common use case, and you cannot prevent a publisher from submitting invalid json, or incorrect structure for your given circe.Decoder

As a workaround so far, I've found this useful:

  /** Convert a decoder producing `A` to a decode that handles failure with `Left` */
  implicit def fallibleDecoder[F[_], A, E](
      implicit decoder: EnvelopeDecoder[F, A],
      F: MonadError[F, E]
  ): EnvelopeDecoder[F, Either[E, A]] =
    decoder.attempt

[stale[bot]]

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[Daenyth]

@gvolpe ^ Is there a way we can configure that bot to exclude certain things?

[gvolpe]

Added the pinned label, that should be enough