We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
Port of OpenJDK 17.0.2, zero VM only.
More work needed to get the full hotspot VM up and running :^)
Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
