Return JsonScope::operator<< overloads for string literals and pointers, because otherwise they are converted to bool.

GitOrigin-RevId: a699415fa15350be1daf9718239b295f272dc3ef

tdutils/td/utils/JsonBuilder.h

@@ -301,6 +301,13 @@ class JsonScope {
   JsonScope &operator<<(double x) {
     return *this << JsonFloat(x);
   }
+  template <size_t N>
+  JsonScope &operator<<(const char (&x)[N]) {
+    return *this << JsonString(Slice(x));
+  }
+  JsonScope &operator<<(const char *x) {
+    return *this << JsonString(Slice(x));
+  }
   JsonScope &operator<<(Slice x) {
     return *this << JsonString(x);
   }