Everywhere: Split Error::from_string_literal and Error::from_string_view

Error::from_string_literal now takes direct char const*s, while
Error::from_string_view does what Error::from_string_literal used to do:
taking StringViews. This change will remove the need to insert `sv`
after error strings when returning string literal errors once
StringView(char const*) is removed.

No functional changes.

Userland/Libraries/LibWasm/AbstractMachine/Validator.h

@@ -31,7 +31,7 @@ struct Context {
 
 struct ValidationError : public Error {
     ValidationError(String error)
-        : Error(Error::from_string_literal(error))
+        : Error(Error::from_string_view(error))
         , error_string(move(error))
     {
     }