Runs the server with the provided service implementation. This function listens for incoming
requests, processes them using the provided service, and sends back the responses. It uses
the inherited file descriptors for communication.
Spawns a new server process using the provided code hash and hash type. This function is similar
to spawn_server, but it uses a specific cell identified by the code_hash and hash_type to
spawn the new process. The function returns the read and write file descriptors for the parent
process to communicate with the child process.