Make the _string, _fly_string, _utf16, and _utf16_fly_string UDL
operators constexpr, with a fast path for short (<= 7 byte) ASCII
literals that folds directly into an inline ShortString. Previously,
every "foo"_fly_string (and friends) involved an out-of-line call
into the string factory, even though the result is entirely known
at compile time.
This implements a FlyString that will de-duplicate String instances. The
FlyString will store the raw encoded data of the String instance: If the
String is a short string, FlyString holds the String::ShortString bytes;
otherwise FlyString holds a pointer to the Detail::StringData.
FlyString itself does not know about String's storage or how to refcount
its Detail::StringData. It defers to String to implement these details.
