Different way of combining Parser0 and Parser

[nightscape]

Hi all!
I'm just trying to port scala-uri from parboiled2 to cats-parse.
One thing I find rather confusing is the with1 method to make a Parser0 behave like a Parser.
I'm wondering if a different way to encode this could work, e.g.

trait LowPriorityImplicits {

  implicit class RichParser0(parser: Parser0) {
    def ~(other: Parser0): Parser0 = ???
  }
}

object Parser0 extends LowPriorityImplicits {
  implicit class EvenRicherParser(parser: Parser0) {
    def ~(other: Parser): Parser = ???
  }
}

val foo0: Parser0 = null
val foo: Parser = null
val concatted: Parser = (foo0 ~ foo)

[johnynek]

That could be nice. If you want to make a PR showing the changes, we could consider it.

I think we would want to be source code compatible with this change, but probably not binary compatible (since we don't want to bring using with1, but maybe make it deprecated or something).