Stop using shading for sbt-bloop modules

[alexarchambault]

It seems both sbt-bloop modules, for sbt 0.13 and 1.0, only depend on bloop-config, whose only notable dependency is jsoniter-scala. As sbt-bloop is usully added alongside other plugins, it seems having these two dependencies shouldn't be a problem (if users have other plugins depending on those, these would bump these dependencies' versions if needed, which is fine as long as these don't break binary compatibility).

So shading could probably be dropped altogether for the sbt-bloop plugins, which would considerably simplify the Bloop build (no need to shade things in meta builds any more).

(Opening this issue in the context of trying to make Scala CLI's Bloop fork and Bloop mainline here converge.)

[tgodzik]

I would love to drop shading if not needed especially that we have a custom solution for it currently :/