List managed processes (incl. recently exited)

{  "procs": [    {      "handle": "string",      "pid": 0,      "cmd": [        "string"      ],      "started_at": 0,      "running": true,      "exit_code": 0,      "exited_at": 0,      "pty": true,      "timed_out": true,      "stdout_len": 0,      "stderr_len": 0    }  ]}