LibJS+Everywhere: Convert JS::Error to String

This includes an Error::create overload to create an Error from a UTF-8
StringView. If creating a String from that view fails, the factory will
return an OOM InternalError instead. VM::throw_completion can also make
use of this overload via its perfect forwarding.

Userland/Libraries/LibJS/Contrib/Test262/$262Object.cpp

@@ -98,7 +98,7 @@ JS_DEFINE_NATIVE_FUNCTION($262Object::eval_script)
         auto& error = script_or_error.error()[0];
 
         // b. Return Completion { [[Type]]: throw, [[Value]]: error, [[Target]]: empty }.
-        return vm.throw_completion<SyntaxError>(error.to_deprecated_string());
+        return vm.throw_completion<SyntaxError>(TRY_OR_THROW_OOM(vm, error.to_string()));
     }
 
     // 5. Let status be ScriptEvaluation(s).