feature(worker): use cgroup track job process, so that they can be all-killed

tests/worker.conf

@@ -10,6 +10,11 @@ api_base = "https://localhost:12345"
 token = "some_token"
 ca_cert = "rootCA.crt"
 
+[cgroup]
+enable = true
+base_path = "/sys/fs/cgroup"
+group = "tunasync"
+
 [server]
 hostname = "localhost"
 listen_addr = "127.0.0.1"