Refactor serialization of first argument in Node class
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@fchollet, @qlzh727
- Updated the serialize_first_arg_tensor function in the Node class to improve handling of various types of first arguments passed to layers.
  - If the first argument is a Keras tensor, it is now serialized with additional metadata including the layer name, node index, and tensor index.
  - For other types such as NumPy arrays, tensors, integers, floats, booleans, and strings, they are directly serialized without additional metadata.
  - Added a ValueError raise statement for invalid first arguments, ensuring that only supported types are accepted.
- Updated the map_arguments method documentation to reflect the changes in serialize_first_arg_tensor. "