Method ~ReadContextGuard

cpp/fory/serialization/fory.h:200–203

public:
  explicit ReadContextGuard(ReadContext &ctx) : ctx_(ctx) {}
  ~ReadContextGuard() {
    ctx_.reset();
    ctx_.detach();
  }

  ReadContextGuard(const ReadContextGuard &) = delete;
  ReadContextGuard &operator=(const ReadContextGuard &) = delete;