Explain the difference between `ObjectMode` and `Buffer` mode in a readable stream.
ObjectMode`: In this mode, a readable stream emits JavaScript objects, making it suitable for transmitting structured data. It's often used when dealing with JSON or other non-binary data formats.
Buffer` mode: In this mode, a readable stream emits binary data in the form of Node.js Buffers. It's commonly used for reading and writing binary data like files. It is the default mode