introduce Username, Realm and Userid api types

and begin splitting up types.rs as it has grown quite large
already

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/api2/node/disks/directory.rs

@@ -133,7 +133,7 @@ pub fn create_datastore_disk(
 
     let to_stdout = if rpcenv.env_type() == RpcEnvironmentType::CLI { true } else { false };
 
-    let username = rpcenv.get_user().unwrap();
+    let userid: Userid = rpcenv.get_user().unwrap().parse()?;
 
     let info = get_disk_usage_info(&disk, true)?;
 
@@ -142,7 +142,7 @@ pub fn create_datastore_disk(
     }
 
     let upid_str = WorkerTask::new_thread(
-        "dircreate", Some(name.clone()), &username.clone(), to_stdout, move |worker|
+        "dircreate", Some(name.clone()), userid, to_stdout, move |worker|
         {
             worker.log(format!("create datastore '{}' on disk {}", name, disk));