Function handle_client 

fn handle_client(stream: TcpStream, connection_id: u64)

Orchestrates the lifecycle of an individual client connection.

Performs the initial protocol handshake and version compatibility check, establishes independent channels for asynchronous communication, and spawns parallel reader and writer threads for the stream.

Arguments

• stream - The active TcpStream associated with the connected client.
• connection_id - The unique identifier assigned to this physical connection.